SpongeBob SquarePants Season 13 Episode 23b Gary's Playhouse Episode Title: Gary's Playhouse Episode Description: SpongeBob builds a playhouse outside for Gary to play in. Gary replaces his shell with a yellow box to look like SpongeBob, then he's eventually joined by a slug playing Patrick, an urchin playing Squidward, and a sea bunny playing Mr. Krabs in tiny versions of their respective residences, including a re-enactment of a moment from the first episode of the series.