<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> <P> Thomas Kretschmann and Henry Goodman reprise their roles as Baron Wolfgang von Strucker and Dr. List, Hydra leaders who specialize in human experimentation, advanced robotics, and artificial intelligence from Captain America: The Winter Soldier . Linda Cardellini portrays Laura Barton, Hawkeye's wife . Claudia Kim portrays Helen Cho, a world - renowned geneticist who helps the Avengers from her office in Seoul, and Andy Serkis portrays Ulysses Klaue, a black - market arms dealer, smuggler and gangster who is a former acquaintance from Stark's weapons - dealing days . Julie Delpy appears as Madame B., who mentored Black Widow into becoming an assassin . Kerry Condon voices the artificial intelligence F.R.I.D.A.Y., a replacement for J.A.R.V.I.S., while Spader also voices Stark's Iron Legion droids . Josh Brolin makes an uncredited appearance during the mid-credits scene as Thanos, reprising his role from Guardians of the Galaxy . Avengers co-creator Stan Lee makes a cameo appearance in the film as a military veteran who attends the Avengers' victory party . Tom Hiddleston was to reprise his role of Loki, but his scenes did not make the theatrical cut of the film . </P> <P>--Joss Whedon, director of Avengers: Age of Ultron, on balancing the film's accessibility and continuity . </P>

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