Living Dead Lock Up (2005)

Escape is only the beginning...

A deep buried secret threatens the inhabitants of Stone Gate Penitentiary. When a petty car thief is sentenced to the prison, he encounters more than he expected. A bizarre occurrence unleashes a hoard of possessed Zombies out into the institute. Now he and his cell mate Miguel must find a way to break out of prison and rescue his girlfriend before they become one of the living dead.