
When Blurp and Slurp find out Sigmund is the grand-prize winner of a contest worth a lot of "clams," they kidnap him while he's out trick-or-treating.
Johnny and Scott bring Sigmund home from the beach and hide him in their clubhouse from Zelda, who invited the sherriff over for dinner. Meanwhile, Sigmund's family gets a visit from their rich Uncle Siggy, who demands to see Sigmund or he'll disinherit the family.
Sigmund falls in love with Fluffy, a dog that belongs to Johnny's girlfriend, Peggy. Sigmund's family schemes to get him back by tricking him into meeting Diana Demon, a sea monster actress who Sigmund has a crush on.