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If you were looking for the article about the episode, then see Wormy.
As a caterpillar, Wormy is a light shade of green with black eyes and white spots.
As a butterfly, Wormy is dark orange with black stripes and black on the outermost parts of his wings; this design is that of a monarch butterfly.
At some point, Sandy bought or found him in Texas. Sometime later, she took Wormy to her home in Bikini Bottom.
He later turned into a butterfly.
When SpongeBob and Patrick were pet sitting for Sandy, they played games such as hide-and-seek and tag. But over night, Wormy metamorphosed into a butterfly and scared everyone in Bikini Bottom because they've never seen a butterfly before.
In The SpongeBob Movie: Sponge Out of Water, a poster of Wormy (in his butterfly form) can briefly be seen in Sandy's Treedome. The image of Wormy on the poster looks very similar to the one seen on the "Beware" fliers made by SpongeBob and Patrick.
The close-up shot of Wormy in his butterfly form is actually footage of a buzzing horsefly.
During the news bulletin about the "monster," the live-action monarch butterfly stock footage depicts a female butterfly (hence the thicker wing veins than the male), suggesting Wormy may have actually been female.
"Wormy" was banned in some countries because of Wormy's disturbing close-up shots.