Mario Rubalcaba (also known by the pseudonym Ruby Mars) is an American drummer from San Diego, notable as a member of numerous rock bands including Clikatat Ikatowi, Thingy, Rocket from the Crypt, Hot Snakes, Earthless, the Sultans, and Off! He has also played on albums by The Black Heart Procession and Pinback and was formerly a professional skateboarder.