"Under Siege 2: Dark Territory" follows the story of former Navy SEAL Casey Ryback, who is now a cook on a train traveling through the Rocky Mountains. When a group of terrorists, led by the ruthless Travis Dane, hijacks the train, they take the passengers hostage and aim to seize control of a satellite weapon system. Ryback, who is traveling with his niece, must rely on his combat skills and resourcefulness to thwart the terrorists' plans. As the tension escalates, Ryback engages in a high-stakes battle against the armed intruders, using the train's environment to his advantage. With time running out and lives at stake, he must outsmart Dane and save the hostages before it's too late. The film combines action, suspense, and thrilling train sequences, making it a gripping sequel to the original "Under Siege."