Hydra (2009)

"Prepare to be consumed."

The Most Dangerous Game formula gets a monstrous twist as the mythical Hydra turns the tables on a group of wealthy human-hunters. Kidnapped along with three ex-convicts, former Marine Tim Nolan is transported to a deserted island where the super rich pay a fortune to hunt human prey. But this island isn't exactly deserted; it's actually home to Hydra the Beast!