<Tr> <Th> 23 </Th> <Td> 23 </Td> <Td> "Fast Enough" </Td> <Td> Dermott Downs </Td> <Td> Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Gabrielle Stanton & Andrew Kreisberg </Td> <Td> May 19, 2015 (2015 - 05 - 19) </Td> <Td> 3J5373 </Td> <Td> 3.87 </Td> </Tr> <Tr> <Td_colspan="8"> Barry visits Thawne in the particle accelerator prison, where Thawne reveals he killed Nora because of hating the Flash, whose future self saved him . Eobard requests Barry to help create a wormhole where Thawne can return to his time, while also allowing Barry to save Nora . Caitlin and Ronnie get married . Eobard tells Cisco that the latter's ability to recall events of alternate timelines was acquired from the particle accelerator explosion . Barry decides to go through with Thawne's offer . The latter states that Barry will have only a short time, or else the wormhole will become a black hole . Barry travels back in time, but his future self signals him not to save Nora . The present Barry returns and stops Thawne from returning to his time . The two fight, while the team shuts down the wormhole . Thawne eventually prevails, but before he can kill Barry, Eddie shoots himself, causing Thawne's existence to cease . The wormhole reappears, and the team is unable to prevent it from becoming a black hole . As the black hole begins to tear the city apart, pulling Eddie inside, Barry speeds into it in an effort to stop it . </Td> </Tr> <Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> Prod . code </Th> <Th> U.S. viewers (millions) </Th> </Tr> <Tr> <Th> 24 </Th> <Td> </Td> <Td> "The Man Who Saved Central City" </Td> <Td> Ralph Hemecker </Td> <Td> Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Andrew Kreisberg & Gabrielle Stanton </Td> <Td> October 6, 2015 (2015 - 10 - 06) </Td> <Td> 3J5651 </Td> <Td> 3.58 </Td> </Tr> <Tr> <Td_colspan="8"> Ronnie and Stein turn into Firestorm and destroy the singularity, but at the cost of Ronnie's life . Six months later, while using his speed to repair Central City, Barry operates alone, being the hero and savior of the public and the local government; Cisco works in the police department alongside Joe, and Caitlin works at Mercury Labs . Barry evaluates a crime scene with a victim named Al Rothstein . At a ceremony, the Flash is attacked by Atom - Smasher, whose strength and size manipulation prove too much for Barry, but manages to force his mask off . Underneath the mask Atom - Smasher is revealed to look exactly like Rothstein . Barry is convinced by Joe and the others that he needs help in taking down certain metahumans and Rothstein is defeated by over absorbing radiation . As he dies, Rothstein tells Barry that he was sent to kill him by a person called Zoom . Barry receives a flash memory from Thawne's lawyer containing Thawne's confession to killing Nora . Henry is exonerated and released from prison, and leaves Central City so that Barry can focus on being the Flash . A man arrives at S.T.A.R. Labs and, introducing himself as Jay Garrick, tells the team their world is in danger . </Td> </Tr> <Tr> <Th> 25 </Th> <Td> </Td> <Td> "Flash of Two Worlds" </Td> <Td> Jesse Warn </Td> <Td> Aaron Helbing & Todd Helbing </Td> <Td> October 13, 2015 (2015 - 10 - 13) </Td> <Td> 3J5652 </Td> <Td> 3.49 </Td> </Tr> <Tr> <Td_colspan="8"> Jay explains to everyone that he is the Flash on a parallel Earth and that he was in a battle with a demonic speedster named Zoom when the singularity brought him to this Earth without his powers . Stein confirms the claim, describing their world as "Earth - 1" and Jay's as "Earth - 2". Zoom brings another metahuman from Earth - 2 called Sand Demon, later identified as Eddie Slick, to kill the Flash . Cisco analyzes the "sand" left behind and has a vision of the previous fight, frightening him . After Slick kidnaps Officer Patty Spivot, Jay teaches Barry how to hurl lightning . Cisco uses his power to find Patty's location . Barry uses the lightning blast to turn Sand Demon's particles to glass, killing him . Patty reveals to Joe that Mark Mardon killed her father . She joins Joe's metahuman task force . Cisco divulges his ability to Stein, and convinces him not to tell anyone . Stein and Cisco are able to locate 52 breaches with the Earth - 2, with the largest one being within S.T.A.R. Labs itself . Joe's estranged wife, Francine, pays him a visit . Stein collapses while talking . On Earth - 2 it's revealed that the Harrison Wells of that world is alive and in charge of S.T.A.R. Labs . </Td> </Tr> <Tr> <Th> 26 </Th> <Td> </Td> <Td> "Family of Rogues" </Td> <Td> John F. Showalter </Td> <Td> Julian Meiojas & Katherine Walczak </Td> <Td> October 20, 2015 (2015 - 10 - 20) </Td> <Td> 3J5653 </Td> <Td> 3.47 </Td> </Tr> <Tr> <Td_colspan="8"> Jay creates a device that stabilizes the singularity and will allow him to return home, but he opts to stay to help Barry stop Zoom . Meanwhile, Lisa Snart shows up asking for Flash's help in rescuing Snart, whom she believes was kidnapped . Barry tracks down Snart, who is revealed not to be kidnapped but is working with his father, Lewis . Lisa states that Snart would never work with Lewis willingly, because the latter was abusive toward her when she was a child . Eventually, the team determines that Lewis placed a bomb inside of Lisa and threatened to kill her if Snart did not help him with his theft . Barry infiltrates Lewis' crew with assistance from Snart . Cisco successfully removes the bomb from Lisa, so Snart uses his cold gun to kill his father in retaliation . Snart is incarcerated in Iron Heights and Lisa leaves . Joe reveals to Iris that Francine is alive and a former addict . Stein turns into Firestorm, but with blue flames . Earth - 2's Wells arrives at the lab through the breach . </Td> </Tr> <Tr> <Th> 27 </Th> <Td> </Td> <Td> "The Fury of Firestorm" </Td> <Td> Stefan Pleszczynski </Td> <Td> Kai Yu Wu & Joe Peracchio </Td> <Td> October 27, 2015 (2015 - 10 - 27) </Td> <Td> 3J5654 </Td> <Td> 3.43 </Td> </Tr> <Tr> <Td_colspan="8"> The team is able to temporarily stabilize Stein . Caitlin states that he needs to merge with a new person in order to survive . She identifies two potential candidates: a scientist named Henry Hewitt and a former high school football star named Jefferson Jackson . Hewitt is excited to merge with Stein, but the attempt fails and Hewitt leaves angrily, not knowing that his own metahuman powers have been activated . Jefferson initially refuses, but agrees when Hewitt goes on rampage . After the successful merger, the new Firestorm joins Barry in helping to take down Hewitt, who is incarcerated . Before departing with Jefferson, Stein encourages Cisco to tell the others about his powers . Meanwhile, Francine reveals that she is suffering from a terminal illness and only has months to live . Iris later confronts her for hiding the existence of the former's brother . In the meantime, Wells breaks into Mercury Labs and steals an unknown device . Later, Barry is attacked by a humanoid shark monster sent by Zoom, but is saved by Wells . </Td> </Tr> <Tr> <Th> 28 </Th> <Td> 5 </Td> <Td> "The Darkness and the Light" </Td> <Td> Steve Shill </Td> <Td> Ben Sokolowski & Grainne Godfree </Td> <Td> November 3, 2015 (2015 - 11 - 03) </Td> <Td> 3J5655 </Td> <Td> 3.87 </Td> </Tr> <Tr> <Td_colspan="8"> Wells, who Cisco nicknames "Harry" to distinguish him from Thawne, reveals that he is responsible for the creation of the metahumans and Zoom on Earth - 2 . He states that he plans to help Barry's team stop Zoom and other metahumans . At the same time, a metahuman from Earth - 2 called Doctor Light arrives and starts robbing banks . Barry recognizes her as the Earth - 2 version of Linda . Later, Light attempts to kill Linda and take over her identity, but accidentally kills Linda's boss and is stopped by Barry's team in the process . Harry reveals Cisco's powers to the team, which Cisco uses to locate Light . Barry defeats her with the help of Harry . After locking Light up, they plan to use her to lure Zoom out and defeat him for good . Jay, who dislikes Harry and vice versa, thinks it is too dangerous and leaves the team . Meanwhile, Barry starts dating Patty while Cisco starts a date with a barista named Kendra Saunders . Cisco picks the nickname "Vibe" for himself . Back on Earth - 2, it is revealed that Zoom has Harry's daughter captive . </Td> </Tr> <Tr> <Th> 29 </Th> <Td> 6 </Td> <Td> "Enter Zoom" </Td> <Td> JJ Makaro </Td> <Td> Gabrielle Stanton & Brooke Eikmeier </Td> <Td> November 10, 2015 (2015 - 11 - 10) </Td> <Td> 3J5656 </Td> <Td> 3.63 </Td> </Tr> <Tr> <Td_colspan="8"> As the team works to find a way to stop Zoom, Doctor Light escapes from her containment cell . Instead, the Earth - 1 Linda agrees to help the team by impersonating Doctor Light . Barry reveals his alter ego to Linda . Harry creates a speed dampening serum and the team stages a fight at one of the breaches in order to trick Zoom through . The attempt fails, as Zoom knew the plan . Instead, he goes after Linda, before fighting Barry . Zoom is much faster and easily overpowers Barry, showing him defeated with his unconscious body to the local news and the police station before ultimately returning to S.T.A.R. Labs . Zoom stabs Barry with his hand, but Cisco shoots him with the serum, which hurts Zoom, but still leaves him with enough speed to escape . Later, Harry reveals that Zoom has his daughter, Jesse, and that he came to Earth - 1 to stop Zoom . Barry wakes from his injuries and discovers that he can no longer feel his legs . </Td> </Tr> <Tr> <Th> 30 </Th> <Td> 7 </Td> <Td> "Gorilla Warfare" </Td> <Td> Dermott Downs </Td> <Td> Aaron Helbing & Todd Helbing </Td> <Td> November 17, 2015 (2015 - 11 - 17) </Td> <Td> 3J5657 </Td> <Td> 3.46 </Td> </Tr> <Tr> <Td_colspan="8"> Barry manages to recover from the paralysis, but is unable to use his powers due to the psychological trauma of Zoom exposing Barry's defeat to the city . Iris reaches out to Henry, who returns to help Barry overcome his fears . Wells formulates a plan to close all of the breaches, except one, through which Zoom can enter into the trap set for him . Cisco touches Kendra, but leaves after seeing a winged person in a vibe . Grodd returns, using scientists to steal various chemicals in the hopes of creating more gorillas with his level of intelligence . He later kidnaps Caitlin to help him with his plan . Harry dresses up as the Reverse - Flash in order to trick Grodd into thinking that his "father" is still alive . The plan works long enough for Harry to rescue Caitlin before they both escape . After Barry is fully recovered, they lure Grodd to one of the dimensional breaches and send him to a jungle sanctuary for gorillas that have been experimented on in Earth - 2 . Later, Cisco meets Kendra again, this time vibing and seeing her as the winged figure . </Td> </Tr> <Tr> <Th> 31 </Th> <Td> 8 </Td> <Td> "Legends of Today" </Td> <Td> Ralph Hemecker </Td> <Td> Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Aaron Helbing & Todd Helbing </Td> <Td> December 1, 2015 (2015 - 12 - 01) </Td> <Td> 3J5658 </Td> <Td> 3.94 </Td> </Tr> <Tr> <Td_colspan="8"> <P> Vandal Savage arrives in Central City, seeking to kill Kendra . Barry goes to Star City and enlists the help of Oliver and his team to protect her . The team is visited by Malcolm who informs them that Savage is an immortal . Later, Kendra is kidnapped by Hawkman, but Barry and Oliver rescue her and capture Hawkman, who introducing himself as Carter Hall, tells them he and Kendra are soulmates who have been connected for millennia . The pair are destined to die, be reborn, and find each other in each lifetime . Carter also reveals that Savage has killed the pair several times, each time growing stronger . Savage acquires the Staff of Horus, a deadly weapon . Kendra unlocks her abilities and the team decides to regroup in Central City, where Oliver witnesses Samantha Clayton with her son, who is also his . Meanwhile, Caitlin and Harry create a serum that will temporarily increase Barry's speed so that he can defeat Zoom . Jay initially refuses to test the serum, but changes his mind to save Harry when the latter is shot by an unaware Patty, whom Joe later informs about the truth . However, Jay advises against using the serum on Barry . </P> This episode begins a crossover event that concludes on Arrow season 4 episode 8 . The two episodes also set up Legends of Tomorrow . </Td> </Tr> <Tr> <Th> 32 </Th> <Td> 9 </Td> <Td> "Running to Stand Still" </Td> <Td> Kevin Tancharoen </Td> <Td> Andrew Kreisberg </Td> <Td> December 8, 2015 (2015 - 12 - 08) </Td> <Td> 3J5659 </Td> <Td> 3.55 </Td> </Tr> <Tr> <Td_colspan="8"> Mardon breaks James Jesse and Snart out of Iron Heights in an effort to team up to kill the Flash . Snart declines and alerts Barry . Jesse and Mardon place bombs hidden in Christmas gifts throughout the city, threatening to set them off in family homes if Barry does not sacrifice himself . Wells, Cisco, and Jay find one of the bombs and alter its magnetic polarity; they send it into one of the dimensional breaches, which causes it to attract the remaining bombs, removing them from the city . With them gone, Barry subdues Mardon and Jesse, dissuading Patty from killing Mardon . Meanwhile, Iris and Barry tell Joe about the latter's son named Wally, who later shows up at Joe's . Caitlin and Jay start a romantic relationship . Elsewhere, Zoom is revealed to be sending metahumans in order to help Barry get faster so that Zoom can take the latter's speed force, which Harry reluctantly agrees to help Zoom with because of his daughter, Jesse . </Td> </Tr> <Tr> <Th> 33 </Th> <Td> 10 </Td> <Td> "Potential Energy" </Td> <Td> Rob Hardy </Td> <Td> Bryan Q. Miller </Td> <Td> January 19, 2016 (2016 - 01 - 19) </Td> <Td> 3J5660 </Td> <Td> 3.41 </Td> </Tr> <Tr> <Td_colspan="8"> Cisco presents a new idea to slow Zoom down, telling the team about a metahuman, whom he has dubbed the "Turtle", who has the ability to stop the kinetic energy around him and slow everyone to a halt . After Barry fails to stop the Turtle, identified as Russell Glosson, at a diamond unveiling, the team sets a trap at an art exhibit . Barry invites Patty with the intention of telling her his secret, but Glosson is aware of the trap and almost kills Patty before escaping . Later, Glosson kidnaps Patty . The team tracks him down and Barry is able to generate enough speed to move through the kinetic waves to knock him unconscious and save Patty . Patty tells Barry that she is leaving Central City and Harry kills Glosson by extracting a portion of his brain matter . Meanwhile, Joe struggles to develop a relationship with Wally, who has been street racing in an attempt to earn enough money for Francine's medical bills . Caitlin discovers that Jay is dying of an illness caused by Zoom stealing his speed . They vow to stop Zoom to get Jay's speed back in order to cure Jay . </Td> </Tr> <Tr> <Th> 34 </Th> <Td> 11 </Td> <Td> "The Reverse - Flash Returns" </Td> <Td> Michael A. Allowitz </Td> <Td> Aaron Helbing & Todd Helbing </Td> <Td> January 26, 2016 (2016 - 01 - 26) </Td> <Td> 3J5661 </Td> <Td> 3.71 </Td> </Tr> <Tr> <Td_colspan="8"> The team discovers Turtle's death and Jay suspects Harry . Cisco asks Harry for help in controlling his vibing abilities . The latter determines they are connected to Cisco's fear response and triggers a vibe which alerts the team that Eobard Thawne is back . Harry surmises that this version of Thawne is from a point in the future before he went back in time to kill Nora and was protected from being erased . Cisco has a vibe of the future, and the team learns that Thawne is planning to use tachyons to return to his time . Barry arrives and destroys the machine . After a race around the city, Barry stops Thawne and imprisons him at the particle accelerator . However, his capture causes a rupture in the timeline that threatens to kill Cisco, so Barry sends Thawne back to the future to save his friend . Meanwhile, Patty discovers Barry is the Flash but, when he refuses to acknowledge it, she chooses to leave the city . Iris learns that Francine's death is imminent and reconciles with her . Wally takes her advice to do the same . </Td> </Tr> <Tr> <Th> 35 </Th> <Td> 12 </Td> <Td> "Fast Lane" </Td> <Td> Rachel Talalay </Td> <Td> Story by: Brooke Eikmeier Teleplay by: Kai Yu Wu & Joe Peracchio </Td> <Td> February 2, 2016 (2016 - 02 - 02) </Td> <Td> 3J5662 </Td> <Td> 3.66 </Td> </Tr> <Tr> <Td_colspan="8"> Right before the particle accelerator explosion, Joey Monteleone was thrown into a tar pit and left for dead . Sealed away, he is freed two years later with the ability to turn his body into molten tar . He sets out to get revenge on those who attempted to kill him . Harry creates a device to siphon Barry's speed energy and attaches it to his suit . It steals a portion of Barry's speed . Wells gives the energy to Zoom, who demands the rest . Meanwhile, Wells and Barry also successfully find a way to close the breaches . While going after Joey, Iris is injured when Barry is too slow to save her . Wells tells the team about the device, asking to be returned to Earth - 2 and have Barry seal the breaches so Zoom cannot re-enter . After stopping Joey, Barry informs Wells that the team will help the latter to save Jesse . In the meantime, Wally continues racing even after Francine's death . </Td> </Tr> <Tr> <Th> 36 </Th> <Td> 13 </Td> <Td> "Welcome to Earth - 2" </Td> <Td> Millicent Shelton </Td> <Td> Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Katherine Walczak </Td> <Td> February 9, 2016 (2016 - 02 - 09) </Td> <Td> 3J5663 </Td> <Td> 3.96 </Td> </Tr> <Tr> <Td_colspan="8"> Before heading to Earth - 2, Barry closes all but one of the breaches, which is at S.T.A.R. Labs . Using the last breach, Barry, Cisco, and Harry travel to Earth - 2, but an energy surge destabilizes the breach and the trio get stuck on Earth - 2 . Barry decides to impersonate his doppelgänger to get more information on Zoom . He later meets the Iris and Joe of Earth - 2 and learns that Iris, who is his doppelgänger's wife, works for the CCPD while Joe is a singer . Barry is attacked by Earth - 2's Caitlin and Ronnie, known as Killer Frost and Deathstorm respectively . Joe is killed in the attack . Cisco attempts to help the police stop the pair, but is confronted by his own evil doppelgänger, known as "Reverb" and revealed to have greater powers, including control over nervous systems and manipulation of vibrations . Barry arrives and is stopped by Reverb and Deathstorm . Zoom arrives, kills Reverb and Deathstorm for harming the Flash, and then imprisons Barry . Meanwhile, a new metahuman named Adam Fells appears in Earth - 1 Central City . Jay tells Caitlin that he invented Velocity - 6, which is the real reason why he lost his speed . Caitlin develops Velocity - 7, which Jay uses to engage Fells, who escapes . </Td> </Tr> <Tr> <Th> 37 </Th> <Td> 14 </Td> <Td> "Escape from Earth - 2" </Td> <Td> JJ Makaro </Td> <Td> Story by: Todd Helbing & Aaron Helbing Teleplay by: David Kob </Td> <Td> February 16, 2016 (2016 - 02 - 16) </Td> <Td> 3J5664 </Td> <Td> 3.90 </Td> </Tr> <Tr> <Td_colspan="8"> On Earth - 2, Zoom issues a demand to Central City to turn in Wells and attacks S.T.A.R. Labs to find Wells and Cisco; but the two escape with Barry - 2 . The trio updates Iris - 2 on what happened with Barry - 1 . They decide to convince Caitlin - 2 to help . After a fight, Caitlin - 2 agrees to take the team to Zoom . They arrive and rescue Barry - 1 and Jesse, but Zoom shows up too . They are able to escape by the help of Caitlin - 2, who keeps Zoom frozen and unable to move, but a third unidentified prisoner, who tries to reveal something about Jay, is left behind . Barry - 2 and Iris - 2 leave Central City to hide from Zoom . Meanwhile on Earth - 1, Caitlin - 1 creates "Velocity 9", which Jay uses to stop Adam, who gets incarcerated in Iron Heights . Caitlin - 1 discovers that Velocity 9 can cure Jay . The latter, Caitlin, Iris and Joe stabilize the breach and allow Barry - 1, Cisco, Harry, and Jesse to return, but Zoom stabs his arm through Jay and pulls him back through the closing breach to Earth - 2 . </Td> </Tr> <Tr> <Th> 38 </Th> <Td> 15 </Td> <Td> "King Shark" </Td> <Td> Hanelle Culpepper </Td> <Td> Benjamin Raab & Deric A. Hughes </Td> <Td> February 23, 2016 (2016 - 02 - 23) </Td> <Td> 3J5665 </Td> <Td> 3.80 </Td> </Tr> <Tr> <Td_colspan="8"> While everyone tries to move on, the humanoid shark - monster that Harry stopped, known as "King Shark," escapes A.R.G.U.S. custody and heads for Central City to kill the Flash . John Diggle and Lyla Michaels, the new director, arrive to warn Barry . King Shark, later identified as Shay Lamden, shows up at Barry's home looking for the Flash, tracking Barry's electrical field . A.R.G.U.S. arrives and forces Shay to retreat . Later, Barry forces King Shark to chase him out on the water, where Barry creates an electrified underwater cyclone that subdues the latter, and allows A.R.G.U.S. to imprison him again, with Lyla planning to find a cure . Barry vows to open a breach back to Earth - 2 to stop Zoom . Meanwhile, Barry and Wally find it hard to develop a relationship . After Caitlin becomes cold due to Jay's death, Cisco becomes scared that she will become Killer Frost; but she assures him that she is only dealing with her grief . Back on Earth - 2, it is revealed that, underneath his mask, Zoom looks exactly like Jay . </Td> </Tr> <Tr> <Th> 39 </Th> <Td> 16 </Td> <Td> "Trajectory" </Td> <Td> Glen Winter </Td> <Td> Lauren Certo & Lilah Vandenburgh </Td> <Td> March 22, 2016 (2016 - 03 - 22) </Td> <Td> 3J5666 </Td> <Td> 3.00 </Td> </Tr> <Tr> <Td_colspan="8"> Barry starts training to get faster so that he can stop Zoom . While out with friends at a club for downtime, Barry and the other club patrons are robbed by an unknown speedster, who then escapes . The speedster turns out to be Eliza Harmon, a Mercury Labs employee who developed Velocity - 9 from samples Caitlin gave her to help with Jay's illness . Operating under the alias "Trajectory", Harmon invades S.T.A.R. Labs, imprisons Barry, and demands more V - 9 . After she threatens Jesse's life, Wells and Caitlin make more of the drug for Harmon, who then speeds off to wreak havoc on the city . Barry manages to stop her before she injects more V - 9 into her system . Barry watches as Harmon's speed becomes so intense that her lightning turns blue and she disintegrates . Jesse decides to leave the city to experience the world on her own and stop Wells from doing harmful things just to protect her . Based on what Barry saw from the overuse of V - 9, the similarities between Zoom's speed and Jay's sickness, and Cisco's "vibe", the team concludes that Jay is Zoom . </Td> </Tr> <Tr> <Th> 40 </Th> <Td> 17 </Td> <Td> "Flash Back" </Td> <Td> Alice Troughton </Td> <Td> Aaron Helbing & Todd Helbing </Td> <Td> March 29, 2016 (2016 - 03 - 29) </Td> <Td> 3J5667 </Td> <Td> 3.39 </Td> </Tr> <Tr> <Td_colspan="8"> Barry travels back in time to when Hartley Rathaway attacked the team, and switches places with his past self, in order to have Thawne help him solve the speed force equation . However, after a Time Wraith follows Barry to the past, Thawne deduces Barry's deception . Barry is able to convince Eobard to help him become faster . The wraith comes to the lab, where Caitlin and Cisco are forced to accept help from Hartley to deter the wraith . Afterward, the Barry from the current time arrives, forcing an explanation of the time travel event . Thawne provides the future Barry with the information about the tachyon technology, so that he can return to his time . As Barry prepares to make the jump through time, the Wraith arrives, forcing the past timeline's Barry to intervene, so that his future self can return . Back in his time, Barry is confronted by the Wraith, but a reformed Hartley arrives with his sonic gauntlets and defeats the wraith . Barry gives Iris a footage of Eddie recorded in the alternate timeline, advising her to move on with her life . </Td> </Tr> <Tr> <Th> 41 </Th> <Td> 18 </Td> <Td> "Versus Zoom" </Td> <Td> Stefan Pleszczynski </Td> <Td> Joe Peracchio & David Kob </Td> <Td> April 19, 2016 (2016 - 04 - 19) </Td> <Td> 3J5668 </Td> <Td> 3.03 </Td> </Tr> <Tr> <Td_colspan="8"> Years earlier on Earth - 2, a young Hunter Zolomon watches as his father murders his mother and is subsequently sent to an orphanage . In the present day, Barry tests the tachyon accelerator and is able to enhance his speed four times greater than normal . Barry decides to re-open a breach back to Earth - 2, and he believes that Cisco's powers are the key to opening the portals . Meanwhile Caitlin reveals that Jay's Earth - 1 doppelgänger is Zolomon and Wells, shocked to hear this, reveals that Earth - 2 Zolomon was a convicted serial killer . Zolomon was receiving electroconvulsive therapy during the explosion, and was one of the many affected . With this revelation, the team confirms that "Jay" is Hunter . Cisco opens a breach, and Zoom immediately appears, chasing Barry back to S.T.A.R. Labs . There, Barry uses images of Zolomon's parents as a distraction to trap him, but Hunter escapes, claiming to be "the darkness". Zolomon kidnaps Wally and demands Barry's speed in exchange for Wally's life . Barry agrees, so Wells siphons all of his speed force, leaving Barry powerless . Zolomon injects the speed force into himself, and he kidnaps Caitlin with his enhanced speed before escaping . </Td> </Tr> <Tr> <Th> 42 </Th> <Td> 19 </Td> <Td> "Back to Normal" </Td> <Td> John F. Showalter </Td> <Td> Brooke Roberts & Katherine Walczak </Td> <Td> April 26, 2016 (2016 - 04 - 26) </Td> <Td> 3J5669 </Td> <Td> 3.39 </Td> </Tr> <Tr> <Td_colspan="8"> As Barry adjusts to life without his powers, Wells decides to leave the lab to look for Jesse . Shortly after speaking with her, Wells is attacked and kidnapped by Griffin Grey, believing him to be Thawne, who demands that Wells find a cure for his metahuman abilities . Grey has superhuman strength, but is also aging rapidly . Barry discovers that, when Grey uses his super strength, he accelerates the aging process . Barry, Joe, Cisco and Jesse manipulate Grey into exerting his powers until he ages and dies as a weak, old man; his body then reverts back to its 18 - year - old self . To fight Zoom, Wells offers to recreate the circumstances that gave Barry his speed . Meanwhile on Earth - 2, Zolomon tells Caitlin that he kidnapped her because he is in love with her . Caitlin encounters her doppelgänger, Killer Frost, who was captured by Zolomon as a reminder of Caitlin . Killer Frost convinces Caitlin to help her escape, but then attempts to kill her . Zoom arrives and kills Killer Frost, then warns Caitlin not to free the man in the iron mask . Later, Hunter decides to conquer the other Earths in the multiverse and takes Caitlin with him back to Earth - 1 . </Td> </Tr> <Tr> <Th> 43 </Th> <Td> 20 </Td> <Td> "Rupture" </Td> <Td> Armen V. Kevorkian </Td> <Td> Kai Yu Wu & Lauren Certo </Td> <Td> May 3, 2016 (2016 - 05 - 03) </Td> <Td> 3J5670 </Td> <Td> 3.34 </Td> </Tr> <Tr> <Td_colspan="8"> While Barry keeps declining Harrison's offer, the team rigs a hologram of the Flash to stop crime around the city so that no one will know the truth . Henry returns to Central City and joins the team . He argues with Wells on the safety of another explosion . Hunter and Caitlin arrive back on Earth - 1 with Hunter declaring the city under his control . Iris confesses her feelings to Barry . The Earth - 2 version of Dante Ramon, called "Rupture", arrives on Earth - 1 looking to kill Cisco, believing that Cisco killed his Earth - 2 brother . Zolomon sends Rupture after the police to send the city a message . Barry and the police stop Rupture, but Zolomon arrives and kills the officers himself, as well as Rupture for failing . He then publicly announces the Flash's disappearance . Cisco and Dante - 1 become closer . Barry finally agrees to Harrison's plan . During the process, Barry is seemingly vaporized, while Jesse and Wally are caught in the blast . </Td> </Tr> <Tr> <Th> 44 </Th> <Td> 21 </Td> <Td> "The Runaway Dinosaur" </Td> <Td> Kevin Smith </Td> <Td> Zack Stentz </Td> <Td> May 10, 2016 (2016 - 05 - 10) </Td> <Td> 3J5671 </Td> <Td> 3.52 </Td> </Tr> <Tr> <Td_colspan="8"> Wally regains consciousness, but Jesse remains in a coma . Cisco has a vibe of Barry and realizes that he is still alive and in the speed force . Barry meets physical manifestations of the speed force in the form of faces familiar to him . The speed force informs Barry that he cannot leave unless he catches a mysterious moving figure, thus gaining his speed back . Cisco and Wells create a path into the speed force so Barry can escape, but the latter chooses to remain so he can earn his powers back . The speed force tells Barry that he cannot become the Flash again until he finally accepts Nora's death . Barry shares a moment with the physical manifestation of Nora, which allows him to finally catch the moving figure himself . With his powers restored and help from Cisco and Iris, Barry returns to S.T.A.R. Labs in time to save the team from the reanimated corpse of Tony Woodward . Afterwards, Barry uses a bit of speed force energy to bring Jesse out of her coma . Across town, Zolomon has assembled an army of metahumans from Earth - 2, planning to unleash them on Central City . </Td> </Tr> <Tr> <Th> 45 </Th> <Td> 22 </Td> <Td> "Invincible" </Td> <Td> Jesse Warn </Td> <Td> Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Brooke Roberts & David Kob </Td> <Td> May 17, 2016 (2016 - 05 - 17) </Td> <Td> 3J5672 </Td> <Td> 3.37 </Td> </Tr> <Tr> <Td_colspan="8"> Caitlin returns to the team, but not without emotional trauma from being kidnapped . Zoom's army wreaks havoc across the city . Barry puts out several fires and takes out some of the metahumans to help the police . Back at S.T.A.R. Labs, Barry displays a level of confidence in stopping Zoom that concerns the team and each of them attempts to convince him to be more cautious . Among the attackers is Laurel Lance's doppelgänger, "Black Siren", who attacks various buildings around Central City using sonic blasts . Wally begins taking on metahumans trying to repay the Flash for saving him . The team creates a sonic amplifier tuned to the frequency of Earth - 2 . They discharge it and render all Earth - 2 natives unconscious, allowing Barry to apprehend them all at once, although Zoom survives by escaping to Earth - 2 . Meanwhile, Cisco begins having vibes of a future Earth - 2 being destroyed . Barry convinces Joe to let Wally be a hero . Later, Zoom returns and kidnaps Henry in front of the team . Barry races after them, revealing his identity to Wally, and is forced to watch Zoom kill Henry . </Td> </Tr> <Tr> <Th> 46 </Th> <Td> 23 </Td> <Td> "The Race of His Life" </Td> <Td> Antonio Negret </Td> <Td> Aaron Helbing & Todd Helbing </Td> <Td> May 24, 2016 (2016 - 05 - 24) </Td> <Td> 3J5673 </Td> <Td> 3.35 </Td> </Tr> <Tr> <Td_colspan="8"> Zolomon manages to escape Barry by creating a time remnant . After Henry's funeral, Hunter challenges Barry to a race to determine who is faster, threatening to kill everyone Barry loves if he refuses . Harrison discovers Hunter is in possession of a magnetar, a device that will destroy every planet in the Multiverse except Earth - 1 which requires both their speeds to power . When an enraged and vengeful Barry refuses to back out, the team locks him in the Pipeline and force Zolomon back to Earth - 2 themselves; but Hunter abducts Joe in the process . Wally discovers this and frees Barry, who agrees to Zolomon's race . As Barry races Zolomon around the magnetar, he creates a time remnant of himself who frees Joe and destroys the machine, but at the cost of his life . The "prime" Barry defeats Zolomon, who is then taken away by Time Wraiths for his crimes against the timeline . Barry rescues the man in the iron mask, who is revealed to be the real Jay Garrick, Henry's Earth - 3 doppelgänger . Wells and Jesse return to Earth - 2 with Jay, who plans to return to Earth - 3 from there . Barry, still feeling broken and defeated, travels back in time and stops Thawne from killing Nora . </Td> </Tr> </Table> <Tr> <Th> No . overall </Th> <Th> No. in season </Th> <Th> Title </Th> <Th> Directed by </Th> <Th> Written by </Th> <Th> Original air date </Th> <Th> Prod . code </Th> <Th> U.S. viewers (millions) </Th> </Tr>

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