- Catherine Morland as Sandy Cheeks
- Richard Conroy as Spongebob
- Det. Lt. Jerry McMullen as Patrick
- John Morland as Mr. Krabs
- Willis as Larry the Lobster
- James O'Neil as Captain Blue SquarePants
- Marian Gordon as Pearl Krabs
- Red Bailey as The Flying Dutchman
- Dorothy as Mrs. Puff
- Det. Sgt. Tom Carey as Gary the Snail
- Denny as Johnny Erain
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