Spongebob shows squidward how they are like brothers, only closer by revealing that they are Siamese twins. Brian Doyle-Murray (born October 31, 1945) is an American actor, voice actor, comedian and screenwriter. Asked in Lyrics and Sheet Music What are the lyrics to SpongeBob ? The older brother of actor/comedian Bill Murray , he has appeared in several films, including Caddyshack , Scrooged , Ghostbusters II , Groundhog Day and The Razor's Edge . SpongeBob is the main characters name who is a sponge in the animated tv program SpongeBob SquarePants.