Robert Downey, Jr. as Tony Stark / Iron Man:
A billionaire industrialist who seeks to pacify the world with a mechanical suit of armor of his own invention. Downey, Jr. was cast as part of his four-picture deal with Marvel Studios, which includes Iron Man 2 and The Avengers.[4]
Chris Evans as Steve Rogers / Captain America:
A World War II veteran who was enhanced to the peak of human perfection by an experimental serum. Evans was cast as part of a deal to star in three Marvel films, in addition to The Avengers.[5] About the character's dual presence in both World War II and the modern era, Evans stated, "In The Avengers, they start to explore this. He's a fish out of water, a man not in his time, and he's just coming to terms with the way the world is now and how it's changed since the '40s. Regarding the dynamic between Captain America and Tony Stark, Evans remarked, "I think there's certainly a dichotomy — this kind of friction between myself and Tony Stark, they're polar opposites. One guy is flash and spotlight and smooth, and the other guy is selfless and in the shadows and kind of quiet and they have to get along. They explore that, and it's pretty fun".[6]
Chris Hemsworth as Thor:
The Asgardian god of thunder. Hemsworth was cast as part of a multiple movie deal.[7] He had previously worked with Joss Whedon on The Cabin in the Woods.[8] Hemsworth stated that he was able to maintain the strength he built up for Thor by increasing his food intake, consisting of a number of chicken breasts, fish, steak and eggs a day. When asked exactly how much, Hemsworth joked, "My body weight in protein pretty much!"[9]
Tom Hiddleston as Loki:
The Asgardian god of mischief.[7] In regards to his character's evolution from the film Thor, Hiddleston stated that "I think the Loki we see in The Avengers is further advanced. You have to ask yourself the question: how pleasant an experience is it disappearing into a wormhole that has been created by some kind of super nuclear explosion of his own making? So I think by the time Loki shows up in The Avengers he’s seen a few things."[10]
Cast of The Avengers at the 2010 San Diego Comic-Con International, with Joss Whedon and Kevin Feige.
Samuel L. Jackson as Nick Fury:
The director of the super-spy agency, S.H.I.E.L.D. Jackson was brought to the project with a deal containing an option to play the character in up to nine Marvel films.[11]
Scarlett Johansson as Natasha Romanoff:
A highly trained spy working for S.H.I.E.L.D.[12] Whedon confirmed that Johansson's Romanoff would be the only female member of the Avengers, but not the only female character in the film.[13]
Jeremy Renner as Clint Barton / Hawkeye:
A master archer known as “the World’s Greatest Marksman”.[14] Renner stated that it will be a very physical role and will be training physically and practicing archery as much as possible in preparation.[15]
Mark Ruffalo as Bruce Banner / Hulk:
A genius scientist who, because of exposure to gamma radiation, transforms into a monster when enraged or excited. Ruffalo was cast after negotiations between Marvel and Edward Norton broke down.[16] About replacing Edward Norton, Ruffalo stated, "I'm a friend of Ed's, and yeah, that wasn't a great way for all that to go down. But the way I see it is that Ed has bequeathed this part to me. I look at it as my generation's Hamlet". About the character he stated, "He's a guy struggling with two sides of himself—the dark and the light—and everything he does in his life is filtered through issues of control. I grew up on the Bill Bixby TV series, which I thought was a really nuanced and real human way to look at The Hulk. I like that the part has those qualities".[17] Regarding the Hulk's place on the team Ruffalo stated, "He's like the teammate none of them are sure they want on their team. He's a loose cannon. It's like, 'Just throw a grenade in the middle of the group and let's hope it turns out well"![18] Ruffalo also told New York magazine that unlike previous incarnations he will actually play the Hulk, "I'm really excited. No one's ever played the Hulk exactly, they've always done CGI. They're going to do the Avatar stop-action, stop-motion capture. So I'll actually play the Hulk. That'll be fun".[19] About his preparation for the role Ruffalo joked, "I've lost 15 pounds and I've put another five on of just strapping, pure USDA beef... They want me mean and lean, but they don't want me big and buff".[20]
Lou Ferrigno voices the Hulk.[21][22]
Cobie Smulders as Maria Hill:
A S.H.I.E.L.D. agent who works closely with Jackson's Nick Fury.[23] Smulders, whom Joss Whedon once considered for his unproduced live-action Wonder Woman film, was selected from a short list of potential actresses including Morena Baccarin. Smulder's deal would integrate her into nine films.[24][25] On her costume, Smulders stated that she had tried on portions of a catsuit and seen conceptual drawings. She went on to say that "t's fascinating to me. I feel like wardrobe becomes very creative on these types of movies because they literally spend weeks designing just the pants or the emblem. It's such an all-consuming process, so I'm excited to see how it all turns out."[23]
Clark Gregg and Stellan Skarsgård reprise their roles from previous films as Phil Coulson and Erik Selvig, respectively.[26][27] Paul Bettany returns to voice JARVIS
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