A brilliant high-tech maniac has seized control of a top-secret satellite and threatens nuclear destruction of the Pentagon and its subterranean nuclear reactor. But the maniac faces one big problem: a Denver Restaurateur, former cook, and lethally talented ex-Navy SEAL, Casey Ryback — it’s our stalwart hero, Steven Seagal.

Travis Dane (Eric Bogosian), a brilliant, maniacal technological expert, has hijacked the Grand Continental, America’s most majestic and elegant train, on a run through the breathtaking Rocky Mountains. With the help of a crack cadre of mercenaries, he converts one of the train’s cars into a mobile — and untraceable — computer command center. Dane uses an array of hyper-modern technology from his headquarters aboard the Grand Continental, barreling undetected through the Colorado wilderness, to seize control of a top-secret satellite. This orbiting super-weapon is capable of laying waste to hundreds of square miles of earth . . . or picking off a single jet in flight. His plan: The nuclear destruction of the entire Eastern seaboard of the United States. His target: The Pentagon and its subterranean nuclear reactor. His price: One billion dollars. His problem: One of the train’s passengers happens to be a Denver Restaurateur, former cook, and lethally talented ex-Navy SEAL, Casey Ryback (Steven Seagal). As the train careens into “Dark Territory” — a dangerous region of wilderness unmarked by directional signals, radio communication, and any possibility of help — the fate of three million people lies in the hands of Ryback alone.

The cast of “Under Siege 2: Dark Territory” also includes Katherine Heigl as Ryback’s 17-year-old rebellious niece and traveling companion; veteran character actor Everett McGill as Penn, Travis Dane’s merciless right-hand man; and Morris Chestnut as Booby, a terrified train porter recruited by Ryback as a reluctant sidekick. In addition to starring in “Under Siege 2,” Seagal is also one of the film’s producers. Geoff Murphy (“Young Guns II”; “Freejack”) directs.