Slimey is Oscar the Grouch's pet worm. Originally, Slimey was a silent character who communicated w/ squeaks & gestures. In recent years, he developed a voice, provided by Dick Maitland (which is digitally manipulated in post-production to achieve a higher pitch). He shows skill at playing the tuba & clarinet, & has the distinction of being the 1st worm on the moon.

Slimey's earliest known appearance is in a season 2 episode in which Oscar enters Slimey in a Sesame Street Pet Show. In another early episode, Oscar accidentally locks himself out of his trash can. Tom suggests that he saw the lock off, but that would ruin the new lock. Luis offers to pry off the lid with his crowbar, but that would dent the lid. Oscar is saved when his pet worm Slimey slithers the key out through the crack between the trash can and lid.

Slimey's family consists of his sister Sloppy, as well as their parents Dusty and Eartha, and his cousins Squirmy and Rachel. Sloppy is referred to as Stella in episode 2123. In episode 4175, Slimey got a pet bug named Dirty.

Slimey enjoys having chapters of "Trash Gordon" read to him before he goes to bed at night. He loves all kinds of books.

The 1st time Slimey and Oscar met was when Oscar went to the park on a rainy day to see the mud puddles and found a mud puddle w/ a lot of worms playing in it. He then saw a baby worm playing by himself, who saw Oscar and crawled up his shoulder and fell asleep. Oscar took the worm back to his trash can and named him Slimey.

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