While working as a human guinea pig (to pay off the family's lost savings after making a bad investment), Homer discovers the root cause of his subnormal intelligence: a crayon that was lodged in his brain ever since he was a boy. He decides to have it removed to increase his IQ, but discovers that being smart does not necessarily equal being happy.
|First Air Date||:||Dec 17, 1989|
|Last Air Date||:||May 12, 2019|
|Number of Episodes||:||663|
|Number of Seasons||:||31|
|Casts||:||Yeardley Smith, Julie Kavner, Nancy Cartwright, Dan Castellaneta, Harry Shearer|
|Alternative Titles||:||Los Simpson, Die Simpsons, Los Simpsons, Los Simpson, The Simpsons, Simpsonlar oilasi|