Picking up after the events of Never Back Down 2, former MMA champion Case Walker is on the comeback trail to become champion once again.

A man's heroic attempt to help a woman in distress ends up with him waking up the next day without a kidney and plotting his revenge.

Suffering from amnesia, a young man trying to discover his true identity is kidnapped by an underground crime organization and turned into a ruthless assassin.

The Devil's Cauldron, a city where depravity and violence has forged a society in which only the lethal and callous can survive, two young men who possess the intellect and ferocity to flourish, carve a name for themselves as the most efficient and unstoppable hit men. Side by side, these two brothers are the deadliest killers, feared by even the most evil criminals. But when a woman of rare beauty mysteriously enters the brother's lives she blinds them with her sweet promises and turns them against each other, resulting in an epic battle that threatens to bring the Devil's Cauldron to the brink of destruction.

Chad Turner ( ) has been implanted with a the only working biometric computer chip (aka The Mark of the Beast) in the world. The chip has the power to change the world with whoever controls it and Joseph Pike ( ) is determined acquire the chip even in the face of the most unforeseen event "The Rapture". Pike has taken hostage Mr.Cooper ( ) the head of security of Avanti the chip maker in order to help locate Turner and deliver the chip to his boss. Amongst the chaos Chad Turner must beat all odds to stay alive and keep the chip from falling into the wrong hands.

Captured international assassins are locked up inside a high-tech bunker known as the Killing Chamber. To break out of this concrete hell they must duel each other, fight deadly ninjas and battle against gangs of masked maniacs. And... if they survive this, they will have to confront Snakehead: the lethal, deranged top dog who will stop at nothing to kill 'em all!