- Ruth Wiley as Sandy Cheeks
- Dick Carver as Spongebob
- John Wiley as SpongeBob's Dad
- Appuhamy as Larry the Lobster
- Chief Planter Atkinson as Johnny Erain
- Doctor Pereira as Stanley S. SquarePants
- Mrs. Lakin as Princess Mindy
- Planter Gordon Gregory as Dr. Gill Gilliam
- Planter Strawson as MermaidMan
- Planter John Ralph as BarnacleBoy
- Planter Chisholm as Gary
- Rayna as Mrs. Puff
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