20 Mind-Blowing Facts You Didn't Know About The Avengers

13. The Avengers Met David Letterman

Late Night With David Letterman was at the height of its popularity back in the mid '80s, and The Avengers comic book was finding a similar level of success, so a crossover was thought up that saw a number of Earth's Mightiest Heroes appear on the show. However, they were ambushed by a villain who tried to take them out with camera mounted lasers. Letterman would save the day by knocking him out with a giant doorknob. Seriously.