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Wormy was a caterpillar that appeared in the episode "Wormy", but he grew up to be a butterfly. The Bikini Bottomites believed it to be a monster. It was captured by Sandy, who knew that it was Wormy.
- In the SpongeBob Leapfrog game, a story shows SpongeBob and Patrick attacked by Wormy and Sandy told SpongeBob and Patrick that the butterfly is just Wormy.
- The close up of the 'butterfly' was actually a closeup of a buzzing horsefly.