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.
Guest Cast
Phil Hartman
voices Troy McClureCast Appearances
Dan Castellaneta
voices Homer Simpson
Julie Kavner
voices Marge Simpson
Nancy Cartwright
voices Bart Simpson
Yeardley Smith
voices Lisa Simpson
Dan Castellaneta
voices Abraham Simpson
Nancy Cartwright
voices Nelson Muntz
Nancy Cartwright
voices Ralph Wiggum
Hank Azaria
voices Chief Clancy WiggumEpisode Discussion
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