Simon Bar Sinister is the main antagonist of the film Underdog. He was a geneticist for a company using dogs as tests subjects for the better of mankind. UnderdogBar 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. Soon his loyal dogs betray him after realizing Simon's treatment on them. The incident resulted in the destruction of his lab that not only scarred his forehead, losing some of his hair, and being limped in his right leg, but created Underdog. Simon Bar Sinister is sent to jail for all his crimes. TriviaSimon Bar Sinister is portrayed by Peter Dinklage.