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.
The Simpsons — Season 12 Episodes (21)
EP 1
E1
EP 2
E2
EP 3
E3
EP 4
E4
EP 5
E5
EP 6
E6
EP 7
E7
EP 8
E8
EP 9
E9
EP 10
E10
EP 11
E11
EP 12
E12
EP 13
E13
EP 14
E14
EP 15
E15
EP 16
E16
EP 17
E17
EP 18
E18
EP 19
E19
EP 20
E20
EP 21
E21
Other Seasons
Season 1 · 18 epSeason 2 · 22 epSeason 3 · 24 epSeason 4 · 22 epSeason 5 · 22 epSeason 6 · 25 epSeason 7 · 25 epSeason 8 · 25 epSeason 9 · 25 epSeason 10 · 23 epSeason 11 · 22 epSeason 13 · 22 epSeason 14 · 22 epSeason 15 · 22 epSeason 16 · 21 epSeason 17 · 22 epSeason 18 · 22 epSeason 19 · 20 epSeason 20 · 21 epSeason 21 · 23 epSeason 22 · 22 epSeason 23 · 22 epSeason 24 · 22 epSeason 25 · 22 epSeason 26 · 22 epSeason 27 · 22 epSeason 28 · 22 epSeason 29 · 21 epSeason 30 · 23 epSeason 31 · 22 epSeason 32 · 22 epSeason 33 · 22 epSeason 34 · 22 epSeason 35 · 18 epSeason 36 · 21 epSeason 37 · 15 ep
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