<Tr> <Th> 42 </Th> <Td> 22 </Td> <Td> "Nevertheless, She Persisted" </Td> <Td> Glen Winter </Td> <Td> Story by: Andrew Kreisberg & Jessica Queller Teleplay by: Robert Rovner & Caitlin Parrish </Td> <Td> May 22, 2017 (2017 - 05 - 22) </Td> <Td> T13. 20172 </Td> <Td> 2.12 </Td> </Tr> <Tr> <Td_colspan="8"> Rhea used Silver Kryptonite to manipulate Kal's senses, causing Kara to appear to be General Zod . Kara eventually overpowers and takes him to the Fortress, where a recovered Kal finds a way to end the invasion . Kara challenges Rhea to Dakkam Ur, a rite in which two leaders duel and the loser concedes the war, accepted by Rhea . Lillian, Lena and Winn build a device to disperse lead into the atmosphere . As lead is lethal to Daxamites, it would make the planet uninhabitable to them . With Mon - El's approval, Kara tells the DEO to use it if she loses . During the duel, Rhea resumes the invasion . M'gann returns with other benevolent White Martians and J'onn awakens to join the battle . Rhea claims the invasion will not stop even if she loses, so Kara launches the device, killing Rhea and forcing the fleet to leave . Kara puts Mon - El in a pod and sends him away from Earth . Cat reassumes her position at CatCo and Alex asks Maggie to marry her . In deep space, Mon - El's pod is drawn into a wormhole . In flashbacks to Krypton's destruction, an unknown faction sends another infant to Earth in order to "reign ." </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> 43 </Th> <Td> </Td> <Td> "Girl of Steel" </Td> <Td> Jesse Warn </Td> <Td> Story by: Andrew Kreisberg Teleplay by: Robert Rovner & Caitlin Parrish </Td> <Td> October 9, 2017 (2017 - 10 - 09) </Td> <Td> T13. 20651 </Td> <Td> 1.87 </Td> </Tr> <Tr> <Td_colspan="8"> Kara has been dreaming of Mon - El and has become obsessive with her vigilantism, ignoring downtime with others in her life . Lena and James oppose industrialist Morgan Edge regarding his plan for waterfront housing estates . James is running CatCo with Cat serving as White House Press Secretary and Snapper on sabbatical . Kara quits CatCo, believing she needs to prioritize being Supergirl and pushing away Alex, who is making plans to marry Maggie . Edge hires criminal Bloodsport to attack the unveiling of a Supergirl statue by the waterfront with a submarine, forcing Kara to go underwater to stop them . When she passes out, her dream of Mon - El rallies her and she stops the attack . In order to nullify Edge's attempts to buy CatCo and silence it, Lena buys it herself . Kara decides to return to CatCo and rejoins her friends . Meanwhile, Samantha (Sam) Arias, a woman whom Alex helped at the waterfront, wakes up after a dream with a disturbing creature . </Td> </Tr> <Tr> <Th> 44 </Th> <Td> </Td> <Td> "Triggers" </Td> <Td> David McWhirter </Td> <Td> Gabriel Llanas & Anna Musky - Goldwyn </Td> <Td> October 16, 2017 (2017 - 10 - 16) </Td> <Td> T13. 20652 </Td> <Td> 1.76 </Td> </Tr> <Tr> <Td_colspan="8"> Kara battles a powerful metahuman bank robber called Psi, who can evoke her victims' deepest fears, forcing Kara to struggle with her memories of Krypton's destruction and her guilt over Mon - El . After Winn's psychic dampener fails, Kara finally overcomes her fear and arrests Psi . Lena decides to run CatCo personally, taking James by surprise and creating friction with Kara, who initially has difficulty separating work and their friendship . Sam Arias' daughter, Ruby, deliberately puts herself in danger to test whether her mother has superpowers, but she is rescued by Kara . Sam begins to question who she is and her origins and becomes Lena's replacement at L - Corp, acting as its CFO . Alex learns that Maggie seems to not want children . J'onn receives a telepathic summons from M'gann, urging him to come to Mars immediately . </Td> </Tr> <Tr> <Th> 45 </Th> <Td> </Td> <Td> "Far From the Tree" </Td> <Td> Dermott Downs </Td> <Td> Jessica Queller & Derek Simon </Td> <Td> October 23, 2017 (2017 - 10 - 23) </Td> <Td> T13. 20653 </Td> <Td> 1.76 </Td> </Tr> <Tr> <Td_colspan="8"> J'onn tells Kara and Alex about M'gann's message and Kara goes with him as back - up . The two journey to Mars in his spaceship, encountering M'gann and the "resistance ." They discover J'onn's father, M'yrnn, has been coerced into giving the White Martians the location of the Staff of Kolar, a psychic weapon that can defeat the resistance . J'onn rescues M'yrnn, who initially believes J'onn is a White Martian in disguise . Eventually, Kara convinces M'yrnn to let J'onn prove his identity . Having acquired the location, the resistance arrives and defeats a contingent of White Martian operatives . The recovered staff is entrusted to J'onn, who returns to Earth with M'yrnn and Kara . Meanwhile, Eliza throws Alex and Maggie a bridal shower . Alex convinces Maggie to invite her father, who comes but still cannot tolerate her homosexuality . She tells him that she no longer needs him because she now has a family who accepts her . However, she confirms to Alex that she does not want children . </Td> </Tr> <Tr> <Th> 46 </Th> <Td> </Td> <Td> "The Faithful" </Td> <Td> Jesse Warn </Td> <Td> Paula Yoo & Katie Rose Rogers </Td> <Td> October 30, 2017 (2017 - 10 - 30) </Td> <Td> T13. 20654 </Td> <Td> 1.82 </Td> </Tr> <Tr> <Td_colspan="8"> The night Kara first revealed her powers and became Supergirl, a grieving passenger, Thomas Coville, was inspired by her . In the present, Kara attends an ostensible self - help group with Winn and James and discovers a "cult" made up of people she previously saved . Led by Coville, they worship Supergirl and follow Kryptonian God Rao's teachings . Those who wish to join initiate disasters so that Supergirl will save them . Coville recognizes Kara in her alter - ego when she confronts him . The group plans to blow up a stadium filled with people . When Kara tries to stop them, she finds Kryptonite inside the bomb which she uses to wound herself, thereby disillusioning the cult . Alex gets rid of the Kryptonite and, with Coville's help, pushes the bomb into a deep hole created by Kara's heat vision, where it detonates . The explosion causes a being in a vessel to awaken . Coville advises Kara to follow Rao to find her path . Meanwhile, Sam has a vision of a monstrous creature in her home, telling her she soon will "reign". Alex reveals to Kara that, while Maggie does not want children, she does . </Td> </Tr> <Tr> <Th> 47 </Th> <Td> 5 </Td> <Td> "Damage" </Td> <Td> Kevin Smith </Td> <Td> Eric Carrasco & Cindy Lichtman </Td> <Td> November 6, 2017 (2017 - 11 - 06) </Td> <Td> T13. 20655 </Td> <Td> 1.87 </Td> </Tr> <Tr> <Td_colspan="8"> Several children are diagnosed with lead poisoning . Morgan publicly blames Lena's lead device which repelled the Daxamites, causing the public to turn on her . She attempts to give a speech to defend herself, but ends up getting shot at . Kara and Sam investigate, discovering that all the affected children attended a public pool laced with a chemical which causes the same symptoms, and the manufacturer is owned by Morgan . Lena confronts Morgan alone . She is knocked unconscious and imprisoned inside a plane with barrels of the chemical, on a collision course to the city's water supply . Lena manages to get a message to Supergirl, who rescues Lena, secures the barrels and destroys the plane . Morgan, however, covers his tracks . Maggie and Alex realize that even though they love each other, they must let each other go because they disagree on having children . Alex lets Maggie know how much she has helped Alex to become happy and accept herself . Maggie, in turn, lets Alex know how stronger she grew as a person . They part tearfully, with Maggie bringing everything full circle: "See you around, Danvers". Sam discovers that she was shot during the attempt on Lena, but was not injured . </Td> </Tr> <Tr> <Th> 48 </Th> <Td> 6 </Td> <Td> "Midvale" </Td> <Td> Rob Greenlea </Td> <Td> Caitlin Parrish & Jess Kardos </Td> <Td> November 13, 2017 (2017 - 11 - 13) </Td> <Td> T13. 20656 </Td> <Td> 1.89 </Td> </Tr> <Tr> <Td_colspan="8"> Kara and Alex arrive at Eliza's home to help overcome their griefs, but they quarrel instead . Ten years prior, while attending Midvale High School, Alex and Kara did not get along, until a mutual friend, Kenny Li, was murdered . A photograph on his laptop revealed their teacher was in a relationship with Alex's best friend . Kara sent the remaining encrypted files to Chloe Sullivan for decryption . After a murder attempt on Alex and Kara's lives, the teacher was arrested, but Alex discovered an alibi for him . Kara decided to cease looking into Kenny's death after a conversation with Noel Neill, an F.B.I. agent who strongly resembles Alura (in reality, a disguised J'onn). Alex went to the sheriff for help, just as Kara learned that the sheriff was involved in drug dealing and was Kenny's killer . Kara saved Alex from being killed by the sheriff . The sisters bonded and Kara decided to not use her powers again, taking Agent Neill's advice to embrace her new home . In the present, after recalling their first adventure together, the sisters reconcile and return to National City . </Td> </Tr> <Tr> <Th> 49 </Th> <Td> 7 </Td> <Td> "Wake Up" </Td> <Td> Chad Lowe </Td> <Td> Gabriel Llanas & Anna Musky - Goldwyn </Td> <Td> November 20, 2017 (2017 - 11 - 20) </Td> <Td> T13. 20657 </Td> <Td> 1.92 </Td> </Tr> <Tr> <Td_colspan="8"> Kara, J'onn, and Winn investigate a crashed spaceship detected beneath National City . They find Mon - El and occupied stasis tanks aboard . They take him back to the DEO; when he attempts an escape, a suspicious Kara locks him in a cell . Mon - El convinces Winn to take him back to the ship, where the life - support systems are unstable . Kara follows them . Mon - El explains that his pod went through a wormhole, bringing him to the 31st century where L - Corp had developed a cure for Daxamites' allergy to lead centuries before . While seven months had passed for Kara, Mon - El experienced seven years in the future . One of the tanks begins to malfunction; Mon - El cannot break it open, so Kara frees its occupant: Mon - El's wife, Imra . J'onn decides to rent an apartment for him and M'yrnn to live together, taking the first step to restore their bond . After discovering another superhuman ability, Sam visits her foster mother and learns of her Kryptonian origins . She later travels to the "Fortress of Sanctuary", where a holographic artificial intelligence reveals that, while Sam's motherhood was unexpected, her Kryptonian physiology is enhanced and she is destined to become the Worldkiller . Despite Sam's resistance, her alternate persona--Reign--is triggered from her subconscious . </Td> </Tr> <Tr> <Th> 50 </Th> <Td> 8 </Td> <Td> "Crisis on Earth - X, Part 1" </Td> <Td> Larry Teng </Td> <Td> Story by: Andrew Kreisberg & Marc Guggenheim Teleplay by: Robert Rovner & Jessica Queller </Td> <Td> November 27, 2017 (2017 - 11 - 27) </Td> <Td> T13. 20658 </Td> <Td> 2.71 </Td> </Tr> <Tr> <Td_colspan="8"> <P> On a parallel world, Earth - X (Earth - 53), a Nazi regime rules the planet where an archer, Dark Arrow, is the Führer, and personally hunts the resistance forces . Dark Arrow seizes a temporal gateway from the Freedom Fighters members including James' parallel universe doppelgänger, a device that allows interdimensional travel to other universes; he schemes to invade parallel Earths with the device to spread his reign so that it may last . Kara and Alex travel to Earth - 1 to attend Barry Allen's wedding with Iris West . Alex meets the Legends' leader Sara Lance / White Canary, taking the first step to recover from her break up with Maggie . The wedding ceremony is interrupted by Earth - X Nazi invaders, led by Dark Arrow, his Kryptonian - powered wife Overgirl, and his partner Prometheus . After Kara defeats and injures Overgirl during the fight the Nazis retreat, and Alex and Sara capture Prometheus to interrogate . As Overgirl recuperates, she, Dark Arrow, and a yellow - clad speedster regroup and discuss their next move, Dark Arrow and Overgirl are revealed as parallel universe doppelgängers of Oliver Queen / Green Arrow and Kara, and the yellow speedster is Barry's nemesis from the 22nd century Eobard Thawne / Reverse - Flash . </P> This episode begins a crossover event that continues on Arrow season 6 episode 8, and concludes on The Flash season 4 episode 8 and Legends of Tomorrow season 3 episode 8 . </Td> </Tr> <Tr> <Th> 51 </Th> <Td> 9 </Td> <Td> "Reign" </Td> <Td> Glen Winter </Td> <Td> Paula Yoo & Caitlin Parrish </Td> <Td> December 4, 2017 (2017 - 12 - 04) </Td> <Td> T13. 20659 </Td> <Td> 1.81 </Td> </Tr> <Tr> <Td_colspan="8"> Sam wakes up at home with no memory of being in a Kryptonian fortress, but finds she is oddly tired . A mysterious Kryptonian symbol, unknown to Kara, appears throughout National City, and Thomas Coville later explains to her that it is a mark of a great evil from Krypton deliberately forgotten from its society . Mon - El and Imra explain how their ship came from the future, and how the former founded the superhero team, the Legion . As Kara hosts a Christmas get - together at her apartment, Sam becomes Reign, who, as a masked vigilante, attacks random people around National City, including Edge . Reign's rampage damages Supergirl's reputation due to her having the same powers and similar physical attributes . Lena and James begin a relationship after an assassination attempt on Lena by Edge . When Kara decides to face Reign, they fight throughout the city; in the process, Kara discovers that Reign is stronger than her . Though the fight clears Supergirl's name and reveals another Kryptonian in National City, Reign eventually overpowers Kara and drops her off a building, requiring emergency medical care from the DEO . On Christmas Day, Ruby runs downstairs to find her mother, but Sam does not seem quite right . </Td> </Tr> <Tr> <Th> 52 </Th> <Td> 10 </Td> <Td> "Legion of Superheroes" </Td> <Td> Jesse Warn </Td> <Td> Derek Simon & Eric Carrasco </Td> <Td> January 15, 2018 (2018 - 01 - 15) </Td> <Td> T13. 20660 </Td> <Td> 2.17 </Td> </Tr> <Tr> <Td_colspan="8"> Kara's injuries are healed by the Legion's technology, but she remains in a coma following her defeat by Reign . The Legion's Coluan member, Brainiac 5, enters her mind to try to wake her . Though Sam continues her life with Ruby, Reign takes control sporadically without Sam's knowledge, and Ruby remains unaware of her mother's divided personality . Reign continues her rampage throughout National City and has a series of confrontations with the DEO and the Legion . Kara emerges from her coma to join them when Reign seeks to destroy a prison . Kara injects Reign with a concentrated dose of liquefied Kryptonite, forcing her to retreat . Prior to Kara's awakening, J'onn, who disguised himself as Kara to cover for her, advises Lena on her new relationship with James . Lena sees that James is not trying to distance himself from her because of her family, but she is afraid to be with him, and they become closer afterward . Kara takes steps to move on from Mon - El after her near - death experience, and develop a friendship with Brainiac 5 . As Reign recuperates in her fortress, she learns that there are other Worldkillers like her, and Coville joins her . </Td> </Tr> <Tr> <Th> 53 </Th> <Td> 11 </Td> <Td> "Fort Rozz" </Td> <Td> Gregory Smith </Td> <Td> Gabriel Llanas & Anna Musky - Goldwyn </Td> <Td> January 22, 2018 (2018 - 01 - 22) </Td> <Td> T13. 20661 </Td> <Td> 2.07 </Td> </Tr> <Tr> <Td_colspan="8"> <Table> <Tr> <Td> </Td> <Td> This episode's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (May 2018) (Learn how and when to remove this template message) </Td> </Tr> </Table> Sam gets ready to go on a trip, leaving Alex to babysit Ruby . The DEO learns that a priestess with knowledge of Reign's true mission is imprisoned in Fort Rozz, which is now drifting near a blue star, which not only strips Kara of her powers but also emits a unique type of radiation fatal to males . Unable to take any of her usual allies, Kara forms a team consisting of herself, Imra, Livewire, and Psi to conduct the search . Reign is informed of their mission and goes to intercept them . Alex helps Ruby confront a girl who cyberbullied her . The team is able to locate the priestess, but Reign kills her after she reveals the existence of two other Worldkillers, Purity and Pestilence, to Kara . Livewire sacrifices herself to save Kara's life, while Psi uses her powers to drive off Reign . Imra's ship begins to drift into the star, but Winn, communicating through the Voyager 2 probe, is able to save the vessel . The team returns to Earth, with Kara repaying Psi's assistance by asking the DEO to give her better accommodations . Mon - El comforts her over Livewire's death, considering it to be redemption for her villainous past . Prompted by a nightmare caused by Psi's influence, Sam asks Alex for help with her "missing time". A woman named Julia Freeman is struck by a runaway car, and is seemingly killed . However, she effortlessly moves the car off her chest, revealing herself to be a Worldkiller . </Td> </Tr> <Tr> <Th> 54 </Th> <Td> 12 </Td> <Td> "For Good" </Td> <Td> Tawnia McKiernan </Td> <Td> Story by: Robert Rovner Teleplay by: Cindy Lichtman & Alix Sternberg </Td> <Td> January 29, 2018 (2018 - 01 - 29) </Td> <Td> T13. 20662 </Td> <Td> 2.11 </Td> </Tr> <Tr> <Td_colspan="8"> <Table> <Tr> <Td> </Td> <Td> This episode's plot summary may be too long or excessively detailed . Please help improve it by removing unnecessary details and making it more concise . (May 2018) (Learn how and when to remove this template message) </Td> </Tr> </Table> Lena is poisoned by an unknown hitman; James pursues him, but the hitman is shot down by an unseen sniper . Kara takes Lena to the DEO, where, using her powers and Alex's medical knowledge, they are able to stabilize her . Lena and Kara gatecrash a party held by Morgan Edge, where Lena tells him that she knows he tried to kill her, and that her mother wants revenge . A drone controlled by Lillian attacks Morgan, prompting him to admit he tried to kill Lena, before Supergirl arrives . Lillian appears, wearing Lex's exoskeleton and wounds Supergirl with a Kryptonite blade . Kara and Mon - El engage in combat with Lillian until Winn hacks the drone to fire on Lillian and disable the armor . Edge tries to escape, with the recorder containing his confession, but is stopped by Guardian, allowing Lena to retrieve the recorder . Sam fears she has a brain tumor due to her memory losses and has Alex runs tests on her, but the tests come back normal . Winn, J'onn, and Mon - El deduce that the Worldkillers are genetically modified to be stronger and more able to blend into the human race than conventional Kryptonians . Suspecting the Worldkillers arrived on Earth around the same time as Superman and have secret identities, Winn discovers four possible women, including Julia Freeman, whom Kara identifies . </Td> </Tr> <Tr> <Th> 55 </Th> <Td> 13 </Td> <Td> "Both Sides Now" </Td> <Td> Jesse Warn </Td> <Td> Jessica Queller & Paula Yoo </Td> <Td> February 5, 2018 (2018 - 02 - 05) </Td> <Td> T13. 20663 </Td> <Td> 2.12 </Td> </Tr> <Tr> <Td_colspan="8"> Supergirl and the DEO converge on Julia Freeman's home; initially she seems normal, but her alter - ego, Purity, takes over and fights them before being subdued . Sam, on sick leave from L - Corp due to her amnesiac episodes, decides to spend time with Ruby by taking her ice skating . However, Reign takes control over Sam after Purity's capture, and abandons Ruby to deal with the DEO . Ruby calls Lena after finding herself alone . Through Purity, Supergirl suspects that each of the Worldkillers' personality is split, including Reign, therefore in order to stop them they need to reach their benevolent sides . When Purity escapes, despite the heroes' attempt to recapture her, Julia regains control but Reign abducts her to the Fortress of Sanctuary to complete her transformation . When repairing the Legion's ship, Mon - El confides to J'onn that he still loves Kara despite also loving Imra, and he did not marry her on his terms . Imra confesses to Mon - El that she and Brainiac 5 have a secret agenda on their mission . At L - Corp, Reign briefly takes control over Sam in front of Lena . </Td> </Tr> <Tr> <Th> 56 </Th> <Td> 14 </Td> <Td> "Schott Through the Heart" </Td> <Td> Glen Winter </Td> <Td> Caitlin Parrish & Derek Simon </Td> <Td> April 16, 2018 (2018 - 04 - 16) </Td> <Td> T13. 20664 </Td> <Td> 1.91 </Td> </Tr> <Tr> <Td_colspan="8"> Kara, Alex and Winn attend his father's funeral . Winn is approached by his estranged mother, Mary, with Winn remaining distant . Kara saves Winn and Mary when the coffin detonates . Mary reveals to Winn that after trying to escape to an abuse shelter, Winn's father ran them off the road and threatened Winn's life if she ever went near him again . Flying monkey toys attack the DEO, which Kara and James fend off . Mary helps her son analyze the toys to discover their origin . Mon - El attempts to reconnect to Kara and reveals the Legion came to National City to stop the Worldkiller Pestilence, who will transform into Blight in 1,000 years . Toyman's penitentiary officer, who sent the toys, kidnaps Mary and holds her at an abandoned toy factory . Kara, Mon - El and Winn save Mary after battling a toy dinosaur and incapacitating the officer . James calls up Lena, who claims to be busy with L - Corp work; she is keeping Sam in a locked medical bay in L - Corp under sedation . </Td> </Tr> <Tr> <Th> 57 </Th> <Td> 15 </Td> <Td> "In Search of Lost Time" </Td> <Td> Andi Armaganian </Td> <Td> Story by: Eric Carrasco Teleplay by: Katie Rose Rogers & Nicki Holcomb </Td> <Td> April 23, 2018 (2018 - 04 - 23) </Td> <Td> T13. 20665 </Td> <Td> 1.38 </Td> </Tr> <Tr> <Td_colspan="8"> Lena brings Sam out of sedation and tells her that her blood tests are normal, but further analysis shows Sam undergoes a metamorphosis at the cellular level when she becomes Reign . Sam refuses to believe her even when shown images of Reign that correspond with the times of her blackouts . At the DEO, M'yrnn performs a ritual to help preserve his mind, but the psychic bleed affects everyone by bringing out their aggression, except for Mon - El (whose Legion ring protects him). Mon - El trains Supergirl on how to use her cape during combat . M'yrnn's ritual causes chaos around the DEO . J'onn convinces M'yrnn to wear a power - dampening bracelet to stop the psychic bleed after a White Martian and other prisoners escape their cells . Lena pushes Sam to the limit emotionally, threatening to keep Ruby away from her, which causes Sam to turn into Reign . After she regains control and Lena shows her video proof of Reign, Sam asks Lena to keep Ruby away from her until she is cured . </Td> </Tr> <Tr> <Th> 58 </Th> <Td> 16 </Td> <Td> "Of Two Minds" </Td> <Td> Alexandra La Roche </Td> <Td> Gabriel Llanas & Anna Musky - Goldwyn </Td> <Td> April 30, 2018 (2018 - 04 - 30) </Td> <Td> T13. 20666 </Td> <Td> 1.50 </Td> </Tr> <Tr> <Td_colspan="8"> The DEO investigates the rash of dead animals; it spreads to humans, as people develop flu - like symptoms with a large scratch on their wrists . Imra believes this is the work of Pestilence, the third Worldkiller . Winn and Alex become part of the infected; Brainiac 5 creates a cure using a blood transfusion from Mon - El and Imra, though it fails . The DEO discovers the person behind the attacks is Grace Parker, who has fully accepted her powers and role as a Worldkiller . Supergirl, Mon - El, and Imra battle Pestilence until Purity arrives to help her escape . Imra is able, however, to gain a blood sample from Pestilence for Brainiac to manufacture a working cure . Lena still holds Sam at the L - Corp lab to run tests, where she causes Reign to appear for brief moments so she can learn more about her . While in Sam's mind, Reign tells her they are coming for them . After detecting Purity and Pestilence approaching L - Corp, Kara, Mon - El, Imra, and J'onn go to warn Lena where they discover Sam . Purity and Pestilence arrive, freeing Reign, and the three fly off together . </Td> </Tr> <Tr> <Th> 59 </Th> <Td> 17 </Td> <Td> "Trinity" </Td> <Td> Caitlin Parrish & Erica Weiss </Td> <Td> Story by: Jessica Queller Teleplay by: Caitlin Parrish & Derek Simon </Td> <Td> May 7, 2018 (2018 - 05 - 07) </Td> <Td> T13. 20667 </Td> <Td> 1.60 </Td> </Tr> <Tr> <Td_colspan="8"> Lena is questioned at the DEO, where she reveals she kept Reign contained using the last of Lex's Kryptonite . At the Fortress of Sanctuary, the Worldkillers work to bring about a total eclipse. Grace is dead, but Sam and Julia are still fighting against the Worldkillers taking control . Kara passes out and sees Sam and Julia in Juru, a Kryptonian valley, while Sam and Julia fight to remember their human lives . Kara asks James to make sure Lena does not possess more Kryptonite; however, James decides to take Lena's word . Brainiac 5 broadcasts Supergirl, Alex and Lena's minds into Juru where they track down Sam and Julia . Sam is reminded of Ruby, which prompts her to retake control of her body on Earth . Sam activates a location beacon for the DEO just as Brainiac pulls Supergirl, Alex and Lena out of Juru . Reign takes back control as the DEO arrive in the Legion ship . A fight culminates in Purity and Pestilence killing each other and Reign absorbing their powers, causing the fortress to collapse . James tells Lena he is Guardian and that Supergirl asked him to confirm there was no more Kryptonite . Lena admits that she made the Kryptonite herself . Reign decides to go after Ruby . </Td> </Tr> <Tr> <Th> 60 </Th> <Td> 18 </Td> <Td> "Shelter from the Storm" </Td> <Td> Antonio Negret </Td> <Td> Story by: Robert Rovner Teleplay by: Lindsay Gelfand & Allison Weintraub </Td> <Td> May 14, 2018 (2018 - 05 - 14) </Td> <Td> T13. 20668 </Td> <Td> 1.53 </Td> </Tr> <Tr> <Td_colspan="8"> Lena and James are attacked by Reign at Lena's place . Lena uses Kryptonite against Reign which forces Reign to retreat . However, Lena learns about Reign's hunt to kill Ruby . Legion's members prepare for return to their time . Lena tells Supergirl and Alex about Lex's mansion where she had arranged for Ruby's stay . Alex visits Ruby to keep her company . Supergirl and J'onn visits Sam's mother to keep her safe from Reign and to set a trap for her when she comes looking for Ruby there . However, Reign kills Sam's mother . Supergirl and J'onn come to know that Reign now has the powers of all three Worldkillers . Reign attacks Alex and Ruby in the mansion, leading the latter to discover her mother's split personality . Mon - El stays behind to help Supergirl . They were able to capture Reign with the help of Kryptonite created by Lena . Later, Alex comforts Ruby following the revelation; Ruby now fears for her mother and herself, knowing that she is Reign's child . Lena tells Kara that Supergirl crossed a line by using her personal relationship with James and will never trust her again, leading to Kara to abashed of her actions and doubting herself of her ethics . </Td> </Tr> <Tr> <Th> 61 </Th> <Td> 19 </Td> <Td> "The Fanatical" </Td> <Td> Mairzee Almas </Td> <Td> Paula Yoo & Eric Carrasco </Td> <Td> May 21, 2018 (2018 - 05 - 21) </Td> <Td> T13. 20669 </Td> <Td> 1.47 </Td> </Tr> <Tr> <Td_colspan="8"> Kara and James discuss Lena's mistrust of Supergirl and keeping secret identities . Tonya, a Coville follower, brings Coville's personal journal for James to give to Supergirl . Mon - El and Kara find remnants of a nuclear explosion at the cult's last location . The cult kidnaps Tonya from CatCo, pursued by Guardian . In the ensuing fight, Olivia (the cult's new leader) shoots off James' mask and the cult escapes after the police arrive; the cult later demands Tonya and the journal from James, threatening to reveal Guardian's secret identity . From Coville's journal, Kara realizes the cult is trying to make a new Worldkiller using a Kryptonian rock . Mon - El purposefully gets kidnapped by the cult as Tonya turns herself over to them . As Olivia starts the ritual to transform herself into a Worldkiller, Mon - El sends a signal for Supergirl to locate them . After a brief fight, Supergirl reasons with Olivia enough for her to give up the desire to be a Worldkiller . Winn and Lena find more of the rock, which can be used to help Sam, on a meteor; Mon - El and Kara fly J'onn's spaceship to travel there . </Td> </Tr> <Tr> <Th> 62 </Th> <Td> 20 </Td> <Td> "Dark Side of the Moon" </Td> <Td> Hanelle Culpepper </Td> <Td> Derek Simon & Katie Rose Rogers </Td> <Td> May 28, 2018 (2018 - 05 - 28) </Td> <Td> T13. 20670 </Td> <Td> TBD </Td> </Tr> <Tr> <Th> 63 </Th> <Td> 21 </Td> <Td> "Not Kansas" </Td> <Td> Dermott Downs </Td> <Td> Gabriel Llanas & Anna Musky - Goldwyn </Td> <Td> June 4, 2018 (2018 - 06 - 04) </Td> <Td> TBA </Td> <Td> TBD </Td> </Tr> <Tr> <Th> 64 </Th> <Td> 22 </Td> <Td> "Make it Reign" </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> June 11, 2018 (2018 - 06 - 11) </Td> <Td> TBA </Td> <Td> TBD </Td> </Tr> <Tr> <Th> 65 </Th> <Td> 23 </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> June 18, 2018 (2018 - 06 - 18) </Td> <Td> TBA </Td> <Td> TBD </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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