“Blood Circus” (** out of four) was a routine underworld melodrama about a retired MMA champion (Jamie Nocher) who becomes entangled in an underground club of brawlers called the Blood Circus in which he must fight to stay alive and protect his family while a concerned former friend and cop (Tom Sizemore) investigates. Half-baked and half-hearted rip-off of “Fight Club” is predictable every step of the way although Sizemore has one of his best roles in years as a sympathetic cop and so does Robert LaSardo as a treacherous thug who puts the club together.