The TV shows produced by animation studio Klasky Csupo -- Rugrats, Wild Thornberrys, The Simpsons, Aahhh!! Real Monsters, the list goes on -- either enchanted or mildly freaked out their young ...

Klasky and Csupo completed the initial episode, titled “Tommy’s First Birthday,” which aired on Nickelodeon Aug. 11, 1991. It was the first of 172 episodes that would be released over 15 years.