http://en.wikipedia.org/wiki/Hulk_(comics)
Iron Man is an American fictional character, a superhero who appears in comic books published by Marvel Comics. The character was created by writer-editor Stan Lee, developed by scripter Larry Lieber, and designed by artists Don Heck and Jack Kirby. He made his first appearance in Tales of Suspense #39 (March 1963).
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http://en.wikipedia.org/wiki/Iron_Man
Thor is a fictional character, a superhero that appears in comic books published by Marvel Comics. The character first appeared in Journey into Mystery #83 (Aug. 1962) and was created by editor-plotter Stan Lee, scripter Larry Lieber, and penciller Jack Kirby.
http://en.wikipedia.org/wiki/Thor_(Marvel_Comics)