Stan Lee, is an American comic book writer, editor, actor, producer, publisher, television personality, and the former president and chairman of Marvel Comics. (Lee, Stan; Mair, George (2002). Excelsior!: The Amazing Life of Stan Lee)
Thor: he was trying to pull Mjolnir out of the ground with his pick-up. The Avengers: he was being interviewed at the end and said something along the lines of "superheros in New York? Give me a break." He also appears in the Spider-Man ride at Universal Studios.