Flats the Flounder

Flats the Flounder is a flounder who was possessed by Weegee to claim the diary of his heir, paralyze all non-fish, and kill SpongeBob after killing his parents offscreen in Part 28. Flats was mistakenly thought to be Weegee's heir, when it was in fact The Magic Hat. Flats blamed SpongeBob for his paralyzing, which lead Chase McFly to find the Magic Hat's diary in SpongeBob's house.