Cast of Kamp Koral: SpongeBob's Under Years

Tom Kenny voices SpongeBob SquarePants, the main protagonist of the series. SpongeBob is an optimistic and energetic sea sponge who works as a fry cook at the Krusty Krab, a fast-food restaurant in the fictional underwater town of Bikini Bottom.

Bill Fagerbakke provides the voice for Patrick Star, SpongeBob's best friend. Patrick is a lovable, but not-so-bright, pink starfish who often joins SpongeBob on his adventures and provides comic relief with his humorous and naive personality.

Rodger Bumpass brings to life the voice of Squidward Tentacles, SpongeBob's grumpy and cynical neighbor. Squidward is an octopus who works alongside SpongeBob at the Krusty Krab and constantly finds himself irritated by SpongeBob's positive attitude.

Clancy Brown portrays the voice of Eugene H. Krabs, the money-obsessed owner of the Krusty Krab. Mr. Krabs is a crustacean with a love for money and is often seen scheming to increase his profits while occasionally taking on a paternal role towards SpongeBob.

Carolyn Lawrence voices Sandy Cheeks, a squirrel from Texas who lives in an air-filled underwater dome in Bikini Bottom. Sandy is a close friend of SpongeBob and Patrick and is known for her athleticism and scientific inventions.

Mr. Lawrence provides the voice for Sheldon J. Plankton, the main antagonist of the series. Plankton is a small green copepod who is constantly devising schemes to steal the Krabby Patty secret formula, the key to the success of the Krusty Krab.

Lori Alan portrays the voice of Pearl Krabs, Mr. Krabs' teenage whale daughter. Pearl is depicted as a stereotypical teenager who enjoys shopping and socializing, often craving the latest fashion trends.

Mary Jo Catlett voices Mrs. Puff, SpongeBob's boating school teacher. Mrs. Puff is a pufferfish who has a tough time instructing SpongeBob due to his reckless driving skills, which always end in chaos and destruction.