SpongeBob SquarePants cast reveals creator Stephen Hillenburg makes a cameo in every episode

Entertainment Weekly

Turns out Hillenburg, who died last November after battling ALS, is the man behind the lips and teeth viewers see in that pirate painting at the beginning of the show’s title sequence. “I don’t know if its common knowledge or not, but when you see the opening and there’s that painting of the pirate and there’s lips moving, that’s Stephen,” Rodger Bumpass, who voices Squidward, said at SpongeBob's Comic-Con panel on Thursday.