<P> Later, with the Avengers having established a new base run by Fury, Hill, Cho, and Selvig, Thor returns to Asgard to learn more about the forces he suspects have manipulated recent events . As Stark leaves and Barton retires, Rogers and Romanoff prepare to train new Avengers: Rhodes, the Vision, Sam Wilson, and Wanda . </P> <P> In a mid-credits scene, Thanos, dissatisfied by the failures of his pawns, dons a gauntlet and vows to retrieve the Infinity Stones himself . </P> <Ul> <Li> Robert Downey Jr. as Tony Stark / Iron Man: The benefactor of the Avengers, who is a self - described genius, billionaire, playboy, and philanthropist with electromechanical suits of armor of his own invention . On how his character evolves after the events of Iron Man 3, Downey said, "I think he realizes that tweaking and making all the suits in the world--which is what he has been doing--still didn't work for that thing of his tour of duty that left him a little PTSD . So his focus is more on how can we make it so that there's no problem to begin with . That, you know, there's a bouncer at our planet's rope . That's the big idea ." </Li> <Li> Chris Hemsworth as Thor: An Avenger and the crown prince of Asgard, based on the Norse mythological deity of the same name . Regarding Thor's place in the film, Hemsworth stated that as Thor has remained on Earth since Thor: The Dark World, and has begun to feel at home here, he considers Ultron's threat a personal attack . Hemsworth stated that he had to work harder to bring new elements to the character to avoid repeating himself saying, "It gave us room to kind of make him a little more grounded and human and have him in some civilian clothes and mixing it up at a party ." Hemsworth noted that Thor's motivations in this film were completely different, as it was the first MCU film where he did not play against Tom Hiddleston's character of Loki . </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 . To prepare for the role, Ruffalo worked with motion capture performer Andy Serkis' The Imaginarium Studios . He stated that his character had grown since the previous film and was "a bit more complex". Ruffalo explained that a confrontation is brewing between Banner and the Hulk saying, "There's a very cool thing happening: Hulk is as afraid of Banner as Banner is afraid of Hulk...and they have got to come to peace somehow with each other ." While filming in London, Ruffalo said that Whedon still had not given him any of the Hulk's lines . Whedon later explained that he writes the Hulk's dialogue spontaneously, saying, "What makes the Hulk so hard to write is that you're pretending he's a werewolf when he's a superhero . You want it vice versa...So the question is, how has he progressed? How can we bring changes on what the Hulk does? And that's not just in the screenplay, that's moment to moment ." </Li> <Li> Chris Evans as Steve Rogers / Captain America: The leader of the Avengers and a World War II veteran, who was enhanced to the peak of human physicality by an experimental serum and frozen in suspended animation before waking up in the modern world . Evans stated that since the fall of S.H.I.E.L.D. in Captain America: The Winter Soldier, Rogers has been left to depend on his Avenger teammates without the structure of military life and is now "looking to understand where he belongs, not just as a soldier, as Captain America, but as Steve Rogers, as a person ." Evans said that he was able to maintain the strength he built up for Captain America: The Winter Soldier by working out up to an hour a day . Regarding Captain America's fighting style, Evans felt he did not want to take a step back from the skills shown in The Winter Soldier, making sure Rogers' fight style advanced, showing "a consistent display of strength" and having Rogers utilizing his environment . </Li> <Li> Scarlett Johansson as Natasha Romanoff / Black Widow: An Avenger who formerly worked for S.H.I.E.L.D. as a highly trained spy . Producer Kevin Feige stated that more of the character's backstory is explored in the film . Johansson elaborated, "In Avengers 2 we go back...we definitely learn more about Widow's backstory, and we get to find out how she became the person you see . All of these characters have deep, dark pasts, and I think that the past catches up to some of us a little bit ." Regarding where the film picks up Widow's story, Johansson felt it was a continuation of what was seen for her character in The Winter Soldier, with the fact that "' (Widow) never made an active choice . (She's) a product of other people's imposition .' That's going to catch up with her . That's bound to have a huge effect . There's got to be a result of that realization...You'll see her actively making some choices in her life, for better or worse ." A mixture of close - ups, concealing costumes, stunt doubles and visual effects were used to help hide Johansson's pregnancy during filming . </Li> <Li> Jeremy Renner as Clint Barton / Hawkeye: An Avenger and master archer who previously worked as an agent for S.H.I.E.L.D. Whedon said that Hawkeye interacts more with the other characters in the film, as opposed to the first film where the character had been "possessed pretty early by a bad guy and had to walk around all scowly ." As the character did not appear in any other of Marvel's Phase Two films, Whedon stated Age of Ultron sheds light on to what the character was doing since the end of The Avengers . Renner described the character as "kind of a loner" and "a team player only' cause he sort of has to be . He's not really a company man . Captain America can be that guy . In (Age of Ultron) you'll understand why (Hawkeye) thinks the way he thinks ." </Li> <Li> Don Cheadle as James "Rhodey" Rhodes / War Machine: An officer in the U.S. Air Force and Tony Stark's close personal friend who operates the War Machine armor . </Li> <Li> Aaron Taylor - Johnson as Pietro Maximoff / Quicksilver: The twin brother of the Scarlet Witch, who can move at superhuman speed . Taylor - Johnson felt Pietro was defined by the fact that he and his sister were abandoned by their family, and they both had to grow up "in Eastern Europe defending and looking out for themselves and each other," that they both look to the other for guidance . Taylor - Johnson also said that Quicksilver was "very overprotective" of Scarlet Witch and has "real anger frustration", which results in him being easily bored because of a short attention span . Feige stated exploring Quicksilver's relationship with his sister and his backstory growing up in Eastern Europe would help differentiate the character from Evan Peters' version in X-Men: Days of Future Past (2014). Taylor - Johnson stated that the running style for Quicksilver went through multiple iterations, saying, "The running style we tested early on was just very one - dimensional and boring to look at, but if you try to do free running, like parkour, then that's very much Captain America's style...You have to find your own place in the stunt world ." Much of Taylor - Johnson's scenes were filmed outdoors to give "life" to his running, as opposed to running indoors in front of a green screen . </Li> <Li> Elizabeth Olsen as Wanda Maximoff / Scarlet Witch: The twin sister of Quicksilver, who can engage in hypnosis and telekinesis . Olsen felt Wanda was "overly stimulated" rather than "mentally insane" because "she has such a vast amount of knowledge that she's unable to learn how to control it . No one taught her how to control it properly...she can connect to this world and parallel worlds at the same time, and parallel times ." Describing her character's mind control powers, Olsen said that the character is able to do more than manipulating someone's mind, with Scarlet Witch able to "feel and see what they feel and see" by projecting visions that they have never seen . Olsen expanded saying, "What I love about her is that, in so many superhero films, emotions are kind of negated a bit, but for her everything that someone else could feel--like their weakest moments--she physically goes through that same experience with them, which is pretty cool ." Olsen drew on her relationship with her older brother and her sisters to prepare for the role, as well as looking to the comics for inspiration . Olsen revealed that Whedon was inspired by dancers as a way to visually represent how the character moves . As such, Olsen mostly trained with a dancer in lieu of traditional stunt training . Olsen is signed for this film and another . </Li> <Li> Paul Bettany as J.A.R.V.I.S. and Vision: Bettany, who voiced J.A.R.V.I.S., Stark's A.I. companion in previous films, was cast again as the Vision, an android created by Ultron . Bettany stated that he was surprised when Whedon asked him if he wanted to be the Vision because once an actor has been cast as a particular character in the MCU, they usually are not cast as another . On what intrigued him about the Vision, Bettany said, "The thing that appealed to me is that this sort of nascent creature being born, being both omnipotent and totally naive, the sort of danger of that and complex nature of a thing being born that is that powerful and that created in a second and the choices he makes morally are really complex and interesting . They've really managed to maintain all of that". Bettany also stated that the Vision feels paternal and protective to a number of people in the film, particularly Scarlet Witch, and has the ability to change his density . Bettany did wire work for the part . Whedon stated he wanted to include the Vision in a second Avengers film before he signed onto the first film . Bettany's make - up, which consisted of a mix of face paint and prosthetics, took two hours to apply with make - up artists Jeremy Woodhead and Nik Williams citing the correct hue of the Vision's skin as the hardest thing to figure out . </Li> <Li> Cobie Smulders as Maria Hill: A former high - ranking S.H.I.E.L.D. agent who now works for Stark . Describing Hill's situation in the film, Smulders said that after The Winter Soldier, Hill does not "really know who's a good guy and who's a bad guy and she's trying to figure out that throughout this film ." She added, "She's not getting any sleep . She's doing all the work . She doesn't have the kind of manpower that she had in S.H.I.E.L.D.," instead working for Tony Stark at the Avenger's headquarters "trying to keep everything running as smoothly as possible...it's an entirely different vibe for her ." </Li> <Li> Anthony Mackie as Sam Wilson / Falcon: A former pararescueman trained by the military in aerial combat using a specially designed wing pack and a friend of Steve Rogers . Discussing the relationship between Wilson and Rogers, Mackie said that the two characters have a mutual "soldier respect", which is explored in the film and in Captain America: Civil War . Feige said that it was decided to reshoot the final scene of the film to incorporate the new Falcon suit designed for Ant - Man, which was released after Age of Ultron, as Falcon was originally shot in his original suit from The Winter Soldier . Mackie stated he did not realize Wilson had become an Avenger until he watched the film at the premiere, as he was only given the script for the scenes he worked on . </Li> <Li> Hayley Atwell as Peggy Carter: A retired officer with the Strategic Scientific Reserve and a co-founder of S.H.I.E.L.D., who is a former love interest of Steve Rogers . </Li> <Li> Idris Elba as Heimdall: The all - seeing, all - hearing Asgardian sentry of the Bifröst Bridge, based on the mythological deity of the same name . </Li> <Li> Stellan Skarsgård as Erik Selvig: An astrophysicist and a friend of Thor . Skarsgård said he was originally not supposed to appear in the film, but received a call because "they'd written a couple of scenes, and I went and did them," not knowing if the scenes would appear in the final cut of the film . </Li> <Li> James Spader as Ultron: An artificial intelligence repurposed by Tony Stark and Bruce Banner for a pilot peace program that is overwhelmed with a god complex, and now desires to pacify the Earth by eradicating humanity . Director Joss Whedon stated that Spader was his "first and only choice" for the role, because of his "hypnotic voice that can be eerily calm and compelling" while also being very human and humorous . Feige clarified that Spader's face and body were motion captured "to create a whole performance...We did not hire James Spader to do a robot voice ." Extensive scans were taken of Spader's head and body in preparation for the role . About the character Whedon said, "He's always trying to destroy the Avengers, goddamn it, he's got a bee in his bonnet . He's not a happy guy, which means he's an interesting guy . He's got pain . And the way that manifests is not going to be standard robot stuff ." Whedon added that Ultron is "not a creature of logic--he's a robot who's genuinely disturbed . We're finding out what makes him menacing and at the same time endearing and funny and strange and unexpected, and everything a robot never is ." Whedon compared Ultron to Frankenstein's monster, saying, "It's our new Frankenstein myth (...) We create something in our own image and the thing turns on us . It has that pain of' Well, why was I made? I want to kill Daddy ."' Spader called the character "self - absorbed" and added, "I think he sees the Avengers as being part of a problem, a more comprehensive problem in the world . He sees the world from a very strange, (biblical) point of view because he's brand new, he's very young...He's immature, and yet has knowledge of comprehensive, broad history and precedent, and he has created in a very short period of time a rather skewed worldview ." Spader elaborates, "He truly is an artificial intelligence with absolutely no censorship at all, no parameters really...he's got too much power, too much strength and speed and size, so he's a very dangerous child ." </Li> <Li> Samuel L. Jackson as Nick Fury: The former director of S.H.I.E.L.D. who originally recruited the Avengers and continues to be a mentor and leader for the team . Jackson described the role as a cameo, saying, "I'm just kind of passing by there...Because, it's another one of those' people who have powers fighting people who have powers' . That's why I didn't get to New York in The Avengers . There's not a lot I could do except shoot a gun ." </Li> </Ul> <Li> Robert Downey Jr. as Tony Stark / Iron Man: The benefactor of the Avengers, who is a self - described genius, billionaire, playboy, and philanthropist with electromechanical suits of armor of his own invention . On how his character evolves after the events of Iron Man 3, Downey said, "I think he realizes that tweaking and making all the suits in the world--which is what he has been doing--still didn't work for that thing of his tour of duty that left him a little PTSD . So his focus is more on how can we make it so that there's no problem to begin with . That, you know, there's a bouncer at our planet's rope . That's the big idea ." </Li>

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