- IMDb: Underdog
 - Voice cast/character credits for the '60s cartoon Underdog, with quotes, trivia, and a fan forum. - Toon Tracker: Underdog
- Fan page dedicated to the cartoon Underdog features pictures and trivia about the animated series.
- TV.com: Underdog
- Features an episode guide for the classic cartoon Underdog, with trivia and pictures.
- Underdog (Movie)@
- Watch the trailer for the 2007 movie Underdog, and find pictures and other info about the live-action version of the classic cartoon. Starring Jason Lee as the voice of Underdog, with Alex Neuberger, Amy Adams, James Belushi, and Patrick Warburton. Directed by Frederik Du Chau.
- Wikipedia: Underdog
- Detailed article about the '60s cartoon Underdog, with info about its history, Underdog's super powers, comic books, and the 2007 movie.
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