Two overly imaginative pranksters named George and Harold, hypnotize their principal into thinking he's a ridiculously enthusiastic, incredibly dimwitted superhero named Captain Underpants.

When timid Jersey crab Armen meets bold tourist sea crab, Ramona, it causes shell-shocking tension in the community. But when the duo is swept away by a storm, they embark on an epic journey to find a home. Their courage unites their families paving the way for great summers to come, Under the Boardwalk.