- Gilbert Grape as Spongebob
- Becky as Sandy Cheeks
- Arnie Grape as Patrick
- Betty Carver as Squilvia
- Bonnie Grape as Mrs. Puff
- Amy Grape as Pearl Krabs
- Ellen Grape as Princess Mindy
- Ken Carver as King Neptune
- Tucker Van Dyke as Larry the Lobster
- Bobby McBurney as Flats the Flounder
- Becky's Grandma as Karen
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