<P> In Wakanda, Rogers reunites with Bucky Barnes before Thanos' army invades . The Avengers, alongside T'Challa and the Wakandan forces, mount a defense while Shuri works to extract the Mind Stone from Vision . Banner, unable to transform into the Hulk, fights in Stark's Hulkbuster armor . Thor, Rocket, and Groot arrive to reinforce the Avengers; Midnight, Obsidian, and Glaive are killed and their army is routed . Thanos arrives and despite Maximoff's attempt to destroy the Mind Stone, removes it from Vision's head, killing him . </P> <P> Thor severely wounds Thanos, but Thanos activates the completed Infinity Gauntlet and teleports away . Half of all life across the universe disintegrates, including Barnes, T'Challa, Groot, Maximoff, Wilson, Mantis, Drax, Quill, Strange, and Parker, as well as Maria Hill and Nick Fury, although Fury is able to transmit a signal first . Stark and Nebula remain on Titan while Banner, M'Baku, Okoye, Rhodes, Rocket, Rogers, Romanoff, and Thor are left on the Wakandan battlefield . Meanwhile, Thanos watches a sunrise on another planet . </P> <Ul> <Li> Robert Downey Jr. as Tony Stark / Iron Man: The leader and benefactor of the Avengers, who is a self - described genius, billionaire, playboy, and philanthropist with electromechanical suits of armor of his own making . Co-director Joe Russo explained that Stark "senses this greater threat approaching, so he is doing everything in his power to keep the Earth safe". Downey added that Stark would have smaller goals than in previous films, with the idea of him as a tinkerer continued from Iron Man 3, although this was not reflected in the final film . </Li> <Li> Chris Hemsworth as Thor: An Avenger and the king of Asgard, based on the Norse mythological deity of the same name . Joe Russo stated that Thor's storyline picks up after the events of Thor: Ragnarok, which finds him in a "very profound...very interesting place" with "real emotional motivation". At the recommendation of Hemsworth, writers Christopher Markus and Stephen McFeely consulted Thor: Ragnarok director Taika Waititi and screenwriter Eric Pearson to help carry over the comedic and tragic elements of the re-toned Thor from that film . Joe Russo said that Thor has "the driving hero's arc of the movie which stands in direct opposition to Thanos' argument" and would have been the main protagonist of the film had Thor killed Thanos . Thor now wields a mystical axe known as Stormbreaker, after the destruction of his hammer Mjolnir in Ragnarok . </Li> <Li> Mark Ruffalo as Bruce Banner / Hulk: An Avenger and a genius scientist who, because of exposure to gamma radiation, transforms into a monster when enraged or agitated . Banner spends the film trying to reintegrate with the Avengers, and also tries to "impress upon everybody how dangerous Thanos is". Joe Russo felt the Hulk refusing to appear for much of the film was only partially because he was scared, but also because he realizes that "Banner only wants Hulk for fighting . I think he's had enough of saving Banner's ass ." Russo added that this was "really reflective of the journey from Ragnarok...(where) these two characters are constantly in conflict with each other over control ." Banner's appearance in the film continues a story arc for the character that was established in Thor: Ragnarok and concludes in the Infinity War sequel, with the difference between Hulk and Banner "starting to blur a little bit". Ruffalo described Hulk in Infinity War as having the mental capacity of a five - year - old . </Li> <Li> Chris Evans as Steve Rogers / Captain America: A fugitive superhero and leader of a faction of Avengers . A World War II veteran, he was enhanced to the peak of human physicality by an experimental serum and frozen in suspended animation before waking up in the modern world . Joe Russo said after the events of Captain America: Civil War, Rogers struggles with the conflict between his responsibility to himself and his responsibility to others . The character embodies the "spirit" of his comic alternate identity Nomad in the film, and receives new vibranium gauntlets from Shuri to replace his traditional shield . An early draft of the film experimented with Rogers first appearing in the film saving Vision from Corvus Glaive's attack in Wakanda . Markus and McFeely said they were called "insane" for waiting that long to introduce Rogers into the film and ultimately conceded it was "not (a) satisfying" approach . </Li> <Li> Scarlett Johansson as Natasha Romanoff / Black Widow: A highly trained spy, a member of Rogers' faction of Avengers, and a former agent of S.H.I.E.L.D. Johansson said that Romanoff's situation in the aftermath of the events of Captain America: Civil War has been "a dark time . I wouldn't say that my character has been particularly hopeful, but I think she's hardened even more than she probably was before ." </Li> <Li> Benedict Cumberbatch as Dr. Stephen Strange: A former neurosurgeon who, after a car accident that led to a journey of healing, discovered the hidden world of magic and alternate dimensions, and became a Master of the Mystic Arts . Markus and McFeely described Strange as "(ending) up being the reasonable adult in the room" with the "widest perspective available" due to the film's stakes . Aaron Lazar served as Cumberbatch's stand - in until the latter completed filming on The Current War . At that point, Cumberbatch re-shot scenes where his face needed to be seen . Julian "JayFunk" Daniels once again assisted Cumberbatch with his finger - tutting movements . </Li> <Li> Don Cheadle as James "Rhodey" Rhodes / War Machine: A colonel in the U.S. Air Force and Avenger who operates the War Machine armor . Following his paralysis during the events of Civil War, Rhodes is given an apparatus by Stark to walk again, although he is reluctant to don his War Machine armor and rejoin the Avengers due to his injury . Cheadle believed that Rhodes is "negotiating this reunion and his rejoining this team". He also explained that Rhodes' relationship with Stark "deepened" from his accident, saying, "I think Tony feels somewhat responsible and culpable in a way . But again, he's always had my back in a way that only he could really have ." </Li> <Li> Tom Holland as Peter Parker / Spider - Man: A teenager and Stark's protegé who received spider - like abilities after being bitten by a genetically - modified spider . Downey helped coach Holland through his death scene, which was not as drawn out in the script . Anthony Russo said, Downey "kept driving: put more and more emotion into it, and just went up to Tom and said,' You don't want to go because you're a child . And you're using your strength as Spider - Man to fight this . And then that was the performance that came out ." </Li> <Li> Chadwick Boseman as T'Challa / Black Panther: The king of the African nation of Wakanda, who gained his enhanced strength by ingesting the Heart - Shaped Herb . </Li> <Li> Paul Bettany as Vision: An android and Avenger created using the artificial intelligence J.A.R.V.I.S., Ultron, and the Mind Stone . Anthony Russo called Vision "a living MacGuffin . Obviously, that raises the stakes because Vision's life is in danger, and his life is in conflict with Thanos' goals, so something's got to give ." </Li> <Li> Elizabeth Olsen as Wanda Maximoff / Scarlet Witch: A member of Rogers' faction of Avengers, who can harness magic and engage in hypnosis and telekinesis . </Li> <Li> Anthony Mackie as Sam Wilson / Falcon: A member of Rogers' faction of Avengers and former pararescueman trained by the military in aerial combat, using a specially designed wing pack . Mackie noted that Wilson has a grudge with other heroes like Iron Man and Black Panther after the events of Civil War . </Li> <Li> Sebastian Stan as Bucky Barnes / Winter Soldier: An enhanced assassin and Rogers' ally and best friend, who reemerged brainwashed after being thought killed in action during World War II . Barnes, who formerly went by Winter Soldier, is given the name White Wolf by the people of Wakanda, who helped remove his Hydra programming . </Li> <Li> Tom Hiddleston as Loki: Thor's adoptive brother, based on the Norse mythological deity of the same name . </Li> <Li> Idris Elba as Heimdall: The all - seeing, all - hearing Asgardian former sentry of the Bifröst Bridge, based on the Norse mythological deity of the same name . </Li> <Li> Peter Dinklage as Eitri: King of the Dwarves of Nidavellir, and weaponsmith, based on the Norse mythological dwarf of the same name . </Li> <Li> Benedict Wong as Wong: One of the Masters of the Mystic Arts, tasked with protecting some of Kamar - Taj's most valuable relics and books . </Li> <Li> Pom Klementieff as Mantis: A member of the Guardians of the Galaxy with empathic powers . </Li> <Li> Karen Gillan as Nebula: An adopted daughter of Thanos who was raised with Gamora as siblings . </Li> <Li> Dave Bautista as Drax the Destroyer: A member of the Guardians and warrior in search of vengeance against Thanos for killing his family . At the end of each day of filming, Bautista would have to sit in a sauna to remove his makeup . </Li> <Li> Zoe Saldana as Gamora: A member of the Guardians, who is an orphan from an alien world and raised by Thanos, seeking redemption for her past crimes . Ariana Greenblatt portrays a young Gamora . </Li> <Li> Vin Diesel as Groot: A member of the Guardians who is a tree - like humanoid . Executive producer James Gunn explained that Groot is still an adolescent in the film, in the same state of growth seen in one of the post-credit scenes in Guardians of the Galaxy Vol. 2 . Terry Notary provided motion capture for Groot, and said the character is "coming of age, so you'll see the teenager find a mentor to look up to and to model himself after". </Li> <Li> Bradley Cooper as Rocket: A member of the Guardians who is a genetically - engineered raccoon - based bounty hunter and mercenary, and is a master of weapons and battle tactics . Sean Gunn was again the stand - in for Rocket during filming, with his acting and expressions serving as motion reference for the character . </Li> <Li> Gwyneth Paltrow as Pepper Potts: Stark's fiancée and the CEO of Stark Industries . Downey felt that "Pepper remains the heart of the (Iron Man) story", which was not a focal point in some of the preceding films with Stark . Downey continued that "we wanted to get back to that reality . Not just for them, but let's really see how that can add to the something - worth - fighting - for of it all ." </Li> <Li> Benicio del Toro as Taneleer Tivan / The Collector: One of the Elders of the Universe, who is an obsessive keeper of the largest collection of interstellar fauna, relics, and species of all manner in the galaxy . </Li> <Li> Josh Brolin as Thanos: An intergalactic despot from Titan who longs to collect all six of the Infinity Stones in order to impose his will on all of reality, wanting to "re-balance the universe". Producer Kevin Feige added that Thanos believes the universe is becoming over-populated, which led to the destruction of his home moon Titan and is something he vowed not to let happen again, and also said "you could almost go so far as to say he is the main character of" the film . McFeely shared this sentiment, describing the film as his "hero journey" in addition to being the film's protagonist, stating, "Part of that is the things that (mean) the most to him . We wanted to show that . It wasn't just power; it wasn't just an ideal; it was people ." Brolin likened Thanos to "the Quasimodo of this time" and the novel Perfume, since Thanos was born deformed and considered a "freak" on Titan, while Joe Russo would reference The Godfather for Brolin at times, which Brolin felt helped "to emotionalize the whole thing". Brolin further added that he preferred playing Thanos over Cable in Deadpool 2 because of the amount of work that went into creating the character . Thanos does not wear armor for most of the film, which is symbolic of his growing power as he collects the Infinity Stones . In addition to voicing for the character, Brolin performed motion capture on set . </Li> <Li> Chris Pratt as Peter Quill / Star - Lord: The half - human, half - Celestial leader of the Guardians who was abducted from Earth as a child, and raised by a group of alien thieves and smugglers called the Ravagers . Pratt described his role in the film as "a cameo...you get to be a little more vibrant; a little more irreverent; a little bit more colorful if you want it to be". </Li> </Ul> <Li> Robert Downey Jr. as Tony Stark / Iron Man: The leader and benefactor of the Avengers, who is a self - described genius, billionaire, playboy, and philanthropist with electromechanical suits of armor of his own making . Co-director Joe Russo explained that Stark "senses this greater threat approaching, so he is doing everything in his power to keep the Earth safe". Downey added that Stark would have smaller goals than in previous films, with the idea of him as a tinkerer continued from Iron Man 3, although this was not reflected in the final film . </Li>

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