SpongeBob falls and hits his head on his way out of Bikini Bottom, and wakes up in New Kelp City where he becomes a hero; however, his old friends miss him and want him to come home.
Provides information about sponges, underwater animals that have no brains, hearts, or blood, explaining how and where they live and eat, and discussing their use by other animals and by humans.
Surveys the classification of different types of sponges, their distinguishing characteristics, life functions, and usefulness to man. Briefly discusses the sponge-fishing industry and sponge collecting.