Flats the Flounder

Flats the Flounder (voiced by Thomas F. Wilson) is a character who first appears in a cameo in the episode "Sandy's Rocket" and later plays his main role in the episode "The Bully."

In the ending credits of The SpongeBob Movie: Sponge Out of Water, Flats makes a cameo appearance along with other Bikini Bottomites.

He later makes cameos in the episodes "Squid Noir" and "Don't Feed the Clowns."