Bad Ass is a 2012 American action film written and directed by Craig Moss. The film stars Danny Trejo, Charles S. Dutton, and Ron Perlman. It is loosely based on the 2010 AC Transit Bus fight viral video.

Danny Trejo is an American actor. Born in Los Angeles, Trejo's film career began in 1985, when he landed a role in Runaway Train (1985). The first film in which he was given a proper credited role was as Art Sanella in Death Wish 4: The Crackdown (1987). He went on to star in a multitude of other films, many of which were small parts as inmates, gangsters, or other criminals, appearing in Desperado, Heat, From Dusk till Dawn (1996), Con Air (1997), The Replacement Killers (1998), Reindeer Games (2000), and Once Upon a Time in Mexico (2003), among others.