Billy is a brown fish who appears in "Squirrel Jokes" and "Walking Small." In the episode "Squirrel Jokes," Billy is in a super market when he walks up to Sandy and then his mother, Mable-Monica says, "Billy, don't talk to a squirrel. You'll catch it's stupid." In "Walking Small," he picks up Plankton's tractor.
"We paid ten dollars for this?"
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