There are three versions of the Pinky and the Brain Theme Song. The first version is performed by the Warners, the second version is performed by a male and female chorus, and the third, probably most well-known version, is sung by an all-male chorus and is used in the spin-off. The music was written by Richard Stone and the lyrics by Tom Ruegger. It is featured as a track on the album Variety Pack. The first version of the intro from Animaniacs is animated by Akom, while the second is animated by Tokyo Movie Shinsha.