The film begins in a jungle at nighttime as a mercenary squad scouts the nearby area looking out for modified super soldiers ("Trigens" in the Game), only to be slaughtered by a lone Mutant. Dr. Krieger (Udo Kier) is then informed by his men about the event and asked to stop the research, Krieger refusing to do so. The film then skips to Valerie Cardinal, a journalist who is secretly receiving information about the events and the actual research by an informant. They then arranged a meeting with her at the Island.
To get to the island, Valerie hired skipper Jack Carver to take her to the Island. Soon after, she reveals to Jack that her informant is named Max and he served in the Special Forces with him and that he is her uncle. Jack denies having ever known him. Jack then takes her to the island. However, it turns out that the mercenaries caught Max and turned up at the spot he was going to meet Valerie. The Mercenaries then captured Valerie and destroyed Jack's boat with an RPG, though Jack managed to escape. Jack then stole a gun from a nearby guard after knocking him out and rescued Valerie. Jack then suggested that they leave the island, though Valerie refuses to leave without Max.
They then hijack a mercenary humvee containing two soldiers and take their uniforms and proceed to the central base where they both are captured. Jack is Jailed in an empty cell with a former member of the cooking staff. While they attempt to escape, Valerie is forced to have dinner with Krieger, who orders the mercenaries to unleash Max (who is now a mutant) on Jack and Cook when he sees them on camera, trying to escape. After a brief fight, Jack manages to convince Max who he really is. Max who is convinced, but still mentally fragile then assaults the mercenaries and releases the other mutants.
The mutants then attempt to kill all the humans on the Island. After taking heavy casualties, half of the Mercenary Forces realize that there is no hope in sight of controlling the mutants and decide to team up with Jack and escape the island. The other half of the Mercenaries remain loyal to Krieger and try to retain control of the island. The two sides then begin to battle each other and the mutants at the same time.
As the battle goes on, Max is shot and killed by Krieger's sadistic female second-in-command, and most of the Mercenaries on the island are killed by the mutants. This leaves only Krieger and his second - in command, Jack and Valerie, and the cook alive. While trying to find Valerie, Jack engages in a fight with Krieger's second in - command. Jack wins and kills the 2nd in command. Jack then finds Valerie and tells her about Max. The cook, Jack, and Valerie then hijack a boat at the docks. When Krieger arrives at the docks shortly after while being chased by mutants, he finds the boat missing. He then turns around and screams as the screen fades to black.
The film then ends with Jack in a relationship with Valerie, while also continuing his work as a skipper. Valerie, like Jack, also continues her work with the CIA. Jack hires the cook for his boat.
What kind of vehicle was hijacked?
Humvee