SpongeBob SquarePants creator Stephen Hillenburg has passed away at the age of 57.

Nickelodeon confirmed the news Tuesday afternoon stating the Hillenburg passed away Monday after a battle with ALS.

Hillenburg created, wrote, produced and directed SpongeBob SquarePants. Since it’s debut in 1999, the aninated series has gone on to spawn hundreds of episodes, movies and a Broadway musical that included songs written by Panic! At The Disco’s Brendan Urie.