Wormy is a caterpillar which is shown in the episode Wormy. Wormy is found inside the Treedome when sandy leaves from a Holiday. Wormy becomes SpongeBob and Patrick's best friend. They play a variety of games together including hide and seek and tag. Wormy gets given a badge that says best friend (meaning SpongeBob and Patrick’s best friend). One night when SpongeBob and Patrick are sleeping wormy turns into a cocoon then a butterfly. The next morning when SpongeBob and Patrick come back there is no Wormy, he is a butterfly. The "Monster-butterfly" of Bikini Bottom until Sandy "rescues" the town. Wormy caused the whole town to be destroyed including the signs and stores...
The life of Wormy is only seen in Wormy and his life as a caterpillar was short, until he turned into a butterfly but he was not seen anymore after that.===Looks===
He is green as a caterpillar, until he transforms into a butterfly. When he turns into a Butterfly he looks/Has:
- A black/brown body.
- Orange wings but with a black outline.
- Black Marks on the wings.
- The close up of the butterfly shows the head of a buzzing horse fly, which some people hate.
- Wormy has also been seen in SpongeBob video games.
- Wormy has been seen in many places in Bikini Bottom, but he never went into SpongeBob's House or Patrick's House.
- Wormy or Sandy's other pets have never been seen again in the series.
- Wormy is a parody of Mothra, a moth monster in the Godzilla films although attacked like Godzilla.