Season 9, Episode 17 Lisa the Simpson
First Aired: March 8, 1998
Grandpa says "Simpson genes" are behind Lisa's sudden lack of brain power; Jasper tries to live for the future in the Kwik-E-Mart freezer. Voices: Yeardley Smith, Dan Castellaneta, Harry Shearer, Nancy Cartwright.
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- Premiered: December 17, 1989
- Rating: TV-PG
- Premise: Matt Groening's subversive, animated satire about Springfield's hapless first family became a cult favorite when it premiered on Fox in 1989 after first being seen in 1987 as a short on 'The Tracey Ullman Show.' That was then; now it's TV longest running c… (more)