It's a jungle out there when a deadly lion attacks a teenage boy deep in the woods. After jumping out of a truck on the way to a movie set, Kensho, a trained mountain lion, is mistaken for the killer lion. Kensho wanders off into the woods leaving an unsuspecting team of animal trainers to arrive at the location only to find that she has escaped. Troy, a respected animal trainer, his wife Jane and their two sons are beside themselves as they return to the animal compound and hear reports of a mountain lion's capture. Their worst fears come true as they discover that Kensho is believed to be the mad lion. Racing to the Sheriff station, Troy and his wife go head to head with a power hungry Deputy. The boys, armed only with tranquilizer gun and determination to save their beloved Kensho, venture out into the woods in search of the real killer lion.