- Norman Bates as Plankton
- Marion Crane as Princess Mindy
- Lila Crane as Sandy Cheeks
- Sam Loomis as Spongebob
- Milton Arborgast as Scooter
- Al Chambers as SpongeBob's Dad
- Dr. Fred Richmond as Mr. Krabs
- Tom Cassidy as Larry the Lobster
- Bob Summerfield as Patchy the Pirate
- Caroline as Pearl
- George Lowery as Squidward
- Mrs. Chamers as Mrs. Puff
- Norma Bates as Karen
- California Charlie as Patrick
- Highway Patrol Officer as Kelpy G.
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