24 Strangest Celebrity Cameos In Comic Book History

20. John Walsh (Dick Tracy)

Chester Gould made history on October 4, 1931 with his comic strip Dick Tracy. Whereas most detective comics at the time were more interested in having huge shootouts between the good guys and bad guys, Dick Tracy was a private eye more interested in solving crimes the Sherlockian way; namely forensic evidence and good old-fashioned deductive reasoning. It was not just the writing though, but the artwork that established Dick Tracy as a leading strip for the ages. The death of Adam Walsh sent his father John Walsh into the world of victim rights, wherein he found himself creating and hosting the show America's Most Wanted in 1988. Deciding that they needed a good celebrity appearance, Dick Tracy runners Mike Curtis and Joe Staton had Tracy work together with Walsh on a chain of murders over the course of three months. In exchange for Walsh's likeness, all they had to do was put a picture of one of the FBI's most wanted at the end of each issue.

19. David Letterman

Yes, believe it or not, Letterman was at one time not only funny, but actually wrote his own material. When Marvel decided to let the assistant editors run the industry for a single month, the host of the semi-eponymous Late Night with David Letterman wound up in a strange issue of The Avengers wherein several of the team's members came on his show. Unbeknownst to them however, a character by the name of Mechano-Marauder has rigged the set with booby traps. In the chaos that follows their triggering, the would-be supervillain is knocked out by Letterman and taken away to jail by The Avengers.