- SpongeBob as Gumball (both are main stars)
- Patrick as Darwin (both are best friends to SpongeBob and Gumball)
- Mindy as Anais
- Mrs. Puff as Nicole
- Mr. Krabs as Richard
- Sandy as Penny (both are love interests to SpongeBob and Gumball)
- Plankton as Mr. Robinson
- Karen as Mrs. Robinson
- Squidward as Banana Joe
- Flats the Flounder as Tobias
- Pearl as Rachel
- Marlin (from Finding Nemo) as Bobert
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