Sylvia

 Sylvia  is Grundgetta 's worm friend (or pet) on Sesame Street. Sylvia appears in episode 3856, where she plans on attending the Wormy Gras parade, dressed as a Grouch in a trash can. To her dismay, she discovers that Slimey  has a costume identical to hers, created by  Oscar  & Baby Bear.

When neither worm wants to attend the holiday festivities dressed like anyone else, their problem turns into an argument, which sparks a situation in which they both begin acting like Grouches. Oscar notes that since this is the only way either of them could successfully be a Grouch -- cause a Grouch can't argue with themselves -- they'll have to go together & continue arguing.

Elated at the notion of being able to attend the parade, the grouchy worms become happy, spoiling Oscar  &  Grundgetta 's revelation cause there's absolutely nothing worse than 2 happy Grouches.

Appearances

 * Sesame Street
 * Episode 3856