Mr. Lawrence as Plankton / Teen Plankton / Rube / Snorkler (voice)

Jill Talley as Karen / All the Karens / Alarm Voice / Stiletto Woman / Old Lady Cane (voice)

Tom Kenny as SpongeBob / Random Student / Gary / French Narrator (voice)

Bill Fagerbakke as Patrick / Troop (voice)

Rodger Bumpass as Squidward / Fish Troop / Goofy Goober Employee (voice)

Carolyn Lawrence as Sandy (voice)

Clancy Brown as Mr. Krabs / Pa Plankton (voice)

Mary Jo Catlett as Mrs. Puff (voice)

Lori Alan as Pearl / A Woman in Crowd (voice)

Dee Bradley Baker as Perch Perkins / Roommate / Guy in the Back of the Crowd / Muscle Fish (voice)

Kate Higgins as Ma Plankton (voice)

Genesis Clarre as Bucket Girl

Sale Taylor as Ice Cream Guy

Natalie Kailey as Sunblock Gal

Austin Valli as Fitness Bro

Abbi Ella Gonzales as Sand Castle Girl

Toby Larsen as Sand Castle Boy

Dave Needham as (Handsome) Plankton (voice)

Lisa Linder as Fish Mom #1 / Fish Mom #2 / Swan / Fish (voice)