Secretly a spy but thought by his family to be a dull salesman, Harry Tasker (Arnold Schwarzenegger) is tracking down nuclear missiles in the possession of Islamic jihadist Aziz (Art Malik). Harry’s mission is complicated when he realizes his neglected wife, Helen (Jamie Lee Curtis), is contemplating an affair with Simon (Bill Paxton), a used-car salesman who claims he’s a spy. When Aziz kidnaps Harry and Helen, the secret agent must save the world and patch up his marriage at the same time.
When an asteroid threatens to collide with Earth, NASA honcho Dan Truman (Billy Bob Thornton) determines the only way to stop it is to drill into its surface and detonate a nuclear bomb. This leads him to renowned driller Harry Stamper (Bruce Willis), who agrees to helm the dangerous space mission provided he can bring along his own hotshot crew. Among them is the cocksure A.J. (Ben Affleck), who Harry thinks isn’t good enough for his daughter (Liv Tyler), until the mission proves otherwise.
When horror novelist Sutter Cane (Jürgen Prochnow) goes missing, insurance investigator John Trent (Sam Neill) scrutinizes the claim made by his publisher, Jackson Harglow (Charlton Heston), and endeavors to retrieve a yet-to-be-released manuscript and ascertain the writer’s whereabouts. Accompanied by the novelist’s editor, Linda Styles (Julie Carmen), and disturbed by nightmares from reading Cane’s other novels, Trent makes an eerie nighttime trek to a supernatural town in New Hampshire.
Wyatt Earp (Kurt Russell) and his brothers, Morgan (Bill Paxton) and Virgil (Sam Elliott), have left their gunslinger ways behind them to settle down and start a business in the town of Tombstone, Ariz. While they aren’t looking to find trouble, trouble soon finds them when they become targets of the ruthless Cowboy gang. Now, together with Wyatt’s best friend, Doc Holliday (Val Kilmer), the brothers pick up their guns once more to restore order to a lawless land.