Simon Bar Sinister is the main antagonist in which American animated TV series?
Correct answer: Underdog

Snance
Underdog was a great cartoon!

Queen
toothless beachrat, Mighty Mouse. “Here I come to save the day!”

Miss Sue
Loved, loved that cartoon show !!!

toothless beachrat
If memory serves (?) I believe Andy Kauffman used to play the theme song during one of his comedy skits.

Just me
Thank you Shoeshine Boy, you're humble and loveable.

Player #27245856
Peter Dinklage of Game of Thrones fame.