Alex Rider (Alex Pettyfer) is a normal teenager who lives with his uncle, a nondescript bank manager… or so it seems until his uncle—Ian Rider (Ewan McGregor)—disappears under mysterious circumstances. Alex soon learns that his uncle was a spy for Britain’s secret intelligence service MI6. Recruited by Mr. Blunt (Bill Nighy) and Mrs. Jones (Sophie Okonedo) of Special Operations, Alex discovers that by encouraging his hobbies, Uncle Ian had actually prepared him for a career in espionage. With Alex’s skills in languages, scuba diving, mountaineering and martial arts, he has all the attributes of a perfect spy. His age not withstanding, Alex endures two weeks of MI6 training. Then, armed with special gadgets to help him, he embarks on his first mission. Billionaire Darrius Sayle (Mickey Rourke) is donating a free Stormbreaker mega-computer to every school in Britain. But is there more to his generosity than meets the eye? MI6 sends Alex in to investigate. Going undercover as the winner of a computer competition, he infiltrates Sayle’s heavily-guarded compound. He meets the tycoon’s sinister sidekicks—vixen publicist Nadia Vole (Missi Pyle) and the disfigured mute Mr. Grin (Andy Serkis)—and gets to test out the impressive and secretive Stormbreaker computer. While exploring an unrestricted area, Alex runs into Yassen Gregorovich (Damian Lewis), the hired gunman responsible for his uncle’s disappearance—he remembers that this assignment is more dangerous than anything he has ever done. But then his investigating pays off. He sees the delivery of strange containers and begins to figure out the mysterious Stormbreakers—he knows he’s onto something big. Suddenly, Alex is captured and has no way to let MI6 know what he has discovered. Before leaving Alex to die in the tank with Sayle’s deadly Portuguese man-of-war, Sayle tells Alex his catastrophic plan for the Stormbreakers. Alex manages to escape using his gadgets, and hitches a ride to London to stop Sayle from activating the Stormbreakers and releasing their secret lethal weapon throughout Britain. But time is running out… With the help of his housekeeper Jack Starbright (Alicia Silverstone) and friend Sabina Pleasure (Sarah Bolger), Alex pursues Sayle through the streets of London bracing for a final showdown at Sayle’s tower, fifty floors above the city. Within days he’s gone from schoolboy to super spy—but will Alex’s first assignment be his last?