The Gruesome Twosome are Big Gruesome (A large mop haired ogre) and Little Gruesome (A pint sized Dracula, bat man). They are the drivers behind the coincidently 2nd numbered racer, the Creepy Coupe, a halloween themed haunted house on wheels. They keep a wide variety of supernatural monsters and gouls inside the belfry to assist them, primarily a fire breathing Dragon. Big Gruesome is the main muscle of the duo, while Little Gruesome is the brains and probably the leader of the two.
Big Gruesome was originally performed by Daws Butler and Lil Gruesome by Don Messick, they are currently performed by Jim Cummings and Billy West.
The Gruesome Twosome hold the most 3rd place winnings out of any other characters.
The Gruesome Twosome are one of three characters who match their car's register number along with the Mean Machine and Bullet-Proof Bomb. (Although they are not the only two passengers, so the Creepy Coupe may carry more characters than even the Bullet-Proof Bomb).