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!

[2] In 1997 he next joined the indie rock band Thingy, performing on the album Songs About Angels, Evil, and Running Around on Fire.

From 1998 to 2000 Rubalcalba moved to Chicago; there he collaborated with guitarist Bill Skibbe and bassist Jessica Ruffins of The Jaks in an experimental, instrumental group called Sea of Tombs.

In September 2000 Rubalcaba returned to San Diego to join Rocket from the Crypt, replacing drummer Adam Willard.

In 2001 he became a founding member of the instrumental psychedelic rock band Earthless with bassist Mike Eginton and guitarist Isaiah Mitchell.

In 2002 he also joined a new lineup of the hardcore punk band Battalion of Saints, reuniting with Clikatat Ikatowi guitarist Scott Bartoloni.

[3] In 2003 he joined Mannekin Piss, in which he played guitar with future Sultans bassist Dean Reis, performing on the 2004 EP Planet Death.

[4] In 2004 he joined one of Rocket from the Crypt singer/guitarist John Reis' other bands, Hot Snakes, replacing drummer Jason Kourkounis.