Wormy (episode)

Wormy" is the ninth episode of the second season and the fiftieth episode of the series. In this episode, while Sandy is away, SpongeBob and Patrick take care of Sandy's pet caterpillar, Wormy, who has then turned into a flying monster.

Plot
SpongeBob and Patrick have given the task of pet sitting Sandy's pets when she is out of town. One of Sandy's pets is a small monarch caterpillar named Wormy. SpongeBob and Patrick quickly befriend the caterpillar and they enjoy a day of play together, however; their fun is disrupted; overnight, when SpongeBob and Patrick aren't at the Treedome, Wormy goes through quick metamorphosis and becomes a monarch butterfly. When SpongeBob and Patrick return in the morning, they think their new friend was eaten by the butterfly. They go berserk as they try to trap the "monster." Unfortunately, Wormy (now as a butterfly) manages to escape the Treedome while flying inside a bubble. SpongeBob and Patrick begin to spread news of the terrible monster throughout Bikini Bottom. Mass chaos erupts and the whole town becomes destroyed and deserted.

Sandy arrives at the shattered town in a few days. She immediately finds Wormy and places him inside a jar. All the townsfolk cheer and celebrate the capturing of the monster.