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Official Site: DreamWorks Classics

Dr. Simon Bar Sinister was the main antagonist in the Underdog cartoon show. Simon was the wickedest man in the world, and it was his ambition to rule the world, but each time, Underdog defeated him.

Voiced by Allen Swift, and based on the voice and looks of Lionel Barrymore, Simon appeared to be only two feet tall.

Simon's most famous saying was, "Simon says!" His henchman was Cad Lackey, who, though generally dull-witted, was occasionally capable of pointing out flaws in his boss's plans. Contrary to the mad scientist stereotype, Simon actually paid attention to Cad's suggestions.

In the 2007 live-action film adaptation, he is portrayed by Peter Dinklage. In the movie, Bar Sinister was originally a geneticist for a company in Capitol City, using dogs as test subjects for the betterment of mankind. But after being laughed at by the Mayor after attempting to have his research expanded to law enforcement, Bar Sinister began his work to create a super-power formula to get revenge. However, the incident resulted in the destruction of his lab that not only caused scarring of his forehead, the loss of some of his hair, and a limp in his right leg, but created Underdog.

Simon Bar Sinister has not been a contender in any CBUB matches.