Season 4 Episode 17 : Once Bitten
One day, Gary bites Squidward and Patrick says he is sick and he has gone mad. Gary goes around town biting everybody and they think they will get sick. A doctor comes in and tells them Gary just had a splinter and it was causing him stress so he bit everybody.
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Previously: Season 4 Episode 16 : New Leaf
Next: Season 4 Episode 18 : Squidtastic Voyage