• 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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