It is the story of a boy named Benny who is bored in the apartment house where his parents don't have time to talk or play with him. Outdoors, Benny catches a tadpole which he takes home into the bathtub. Benny discovers the tadpole is an enchanted prince, who dives with Benny to the bottom of the bathtub and into a magical ocean world. In this fantastic world Benny meets pirates, mermaids and an octopus and experiences the things he misses in his daily life.