When the Simpsons discover a collection of keys to every door in Springfield, Lisa stumbles upon an eerie hidden classroom beneath Springfield Elementary School. When she shares her discovery with Principal Skinner, the secret room mysteriously disappears and he takes the only key away. A determined Lisa uses her detective skills to lead her back to the room to solve an old school mystery.
Cast Appearances
Dan Castellaneta
voices Homer Simpson
Julie Kavner
voices Marge Simpson
Nancy Cartwright
voices Bart Simpson
Yeardley Smith
voices Lisa Simpson
Dan Castellaneta
voices Barney Gumble
Nancy Cartwright
voices Nelson Muntz
Hank Azaria
voices Chief Clancy WiggumEpisode Discussion
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