Hydra (2009)

On a remote island, the chilling premise of "The Most Dangerous Game" mutates into a desperate fight for survival against a legendary terror. Former Marine Tim Nolan, abducted alongside hardened criminals, finds himself the unwilling prey in a perverse game orchestrated by the ultra-rich. They pay exorbitant sums to hunt humans, but their cruel diversion takes a deadly turn. Unbeknownst to the hunters, they are not alone, for the island is the ancient lair of the monstrous Hydra, and the roles of hunter and hunted are about to be brutally reversed.