Sherman's Lagoon is an imaginary lagoon somewhere in the tropics, inhabited by a cast of sea creatures whose lives are curiously similar to our own.

Sherman, the main character, is a great white shark who is completely unaware of how intimidating his species can be. He gets pushed around by the other characters, namely: Hawthorne the hermit crab, Fillmore the sea turtle, and his wife, Megan, who is another great white shark, of course.