Frank's life takes a turn when his mother, Juanita, passes away, leaving him her house and dog.

His best friend and fellow veteran, Klondike Washington, moves in with him and entrusts Frank with a USB flash drive meant for Juanita's safe deposit box.

Feeling let down by the police's lack of progress in solving Klondike's murder, Frank takes it upon himself to investigate.

Frank discovers that Klondike was killed because he possessed the flash drive, which contains information about an oil well project connected to Mayor Williams.

During a dinner at Amber's house, Frank asks for a matchbook as a memento, but their moment is interrupted by Martin, Jr. Frank eventually hands the flash drive to Officer Malark and confronts Panther, the drug lord responsible for Klondike's murder.

Their battle spills into the front yard, where Amber jumps on Panther's back, buying Frank enough time to recover and defeat him.

Bad Ass was very loosely based on the AC Transit Bus fight, which was filmed by a bystander and became a viral video on YouTube.

[5] Vulture's Sarah Benned commented on the preview, saying "This trailer for Bad Ass (loosely based on this viral video) is either a parody, the trailer for a parody, or just an excuse to make Danny Trejo beat people up while wearing a fanny pack.

Perhaps it is just difficult to compete with the strange spontaneity of something like a viral video; the way it takes on its own momentum may be something that can't be replicated.