Sponge the Horse is an alter-ego of SpongeBob who appears in the episode "Pat the Horse."
He looks just like SpongeBob, but behaves more like a horse. However, he still retains several characteristics of SpongeBob.
Role in episode
Sponge the Horse appears in the last few minutes of the episode. At the end, he gives Squidward a ride back to the Krusty Krab.