Billy the Snail is a sea snail who only appears in the episode "Gary in Love." His owner is Brad.
Billy has a light pink colored shell like Gary, but is lighter and glossy, and on his shell, there are no dots, just red lines like Gary's, but much thinner. He has green skin with a blue underside, styled black hair, and blue eyes. He has a brown leash. He appears to be more sophisticated than most snails.
After Billy came back from going for a walk with Brad, he met Mary. Billy became her new boyfriend, which made Gary and Mary's Ex-boyfriend very sad.
When he says "meow," instead of saying it like most snails, his meow sounds like a man's.