The highly-anticipated sequel "Avengers: Age of Ultron" makes use of a number of Marvel Comics characters, chief among them, Captain America, who made his debut nearly 75 years ago. These Marvel characters also are featured in the movie.
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Chris Evans has portrayed Captain America in four movies, with more to come.
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Marvel's interpretation of the Norse god Thor is now the best-known one in pop culture.
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Chris Hemsworth is now making his fourth appearance as the Norse god.
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Black Widow started out as a villain during the Cold War Marvel Comics, but is now a hero.
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Scarlett Johansson's Black Widow has been ubiquitous in many Marvel movies.
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Iron Man was a popular character in the Marvel world.
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... But was never as popular as he is now, as portrayed by Robert Downey Jr. in a number of movies.
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The Hulk is one of Marvel's best-known characters.
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Mark Ruffalo's portrayal of Bruce Banner drew praise in the first "Avengers."
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Hawkeye is a mainstay on the Avengers team in the comics.
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Jeremy Renner, as Hawkeye, has a larger role in "Age of Ultron."
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Tony Stark's friend "Rhodey" has an alter ego of War Machine.
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Don Cheadle makes his first "Avengers" appearance as War Machine.
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The siblings Quicksilver and Scarlet Witch have not always been on the side of good.
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Aaron Taylor-Johnson and Elizabeth Olsen portray them for the first time in "Age of Ultron."
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The AI hero, the Vision has been a member of the team since the late 1960s.
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Paul Bettany, who has voiced Tony Stark's computer, JARVIS, for years, finally takes a role onscreen as the Vision.
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Ultron is one of the most dangerous villains in Marvel Comics, since 1968.
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James Spader plays the evil robot in the sequel named after him.
