Avengers: From Comics to Screen Updated 10:52 AM EDT, Thu April 30, 2015 James Spader plays the evil robot in the sequel named after him. 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. Chris Evans has portrayed Captain America in four movies, with more to come. Marvel's interpretation of the Norse god Thor is now the best-known one in pop culture. Chris Hemsworth is now making his fourth appearance as the Norse god. Black Widow started out as a villain during the Cold War Marvel Comics, but is now a hero. Scarlett Johansson's Black Widow has been ubiquitous in many Marvel movies. Iron Man was a popular character in the Marvel world. ... But was never as popular as he is now, as portrayed by Robert Downey Jr. in a number of movies. The Hulk is one of Marvel's best-known characters. Mark Ruffalo's portrayal of Bruce Banner drew praise in the first 'Avengers.' Hawkeye is a mainstay on the Avengers team in the comics. Don Cheadle makes his first 'Avengers' appearance as War Machine. The siblings Quicksilver and Scarlet Witch have not always been on the side of good. Aaron Taylor-Johnson and Elizabeth Olsen portray them for the first time in 'Age of Ultron.'