- Greg Heffley as SpongeBob
- Rowley Jefferson as Patrick
- Robert Jefferson as Squidward (Robert and Squidward Both Dislike Greg and SpongeBob)
- Manny Heffley as Gary (Manny and Gary Both Have Names That End With "Y")
- Frank Heffley as Mr. Krabs
- Holly Hills as Sandy
- Rodrick as Plankton
- Patty Ferrell as Karen
- Heather Hills as Pearl
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