Fifteen-year-old Alex Pettyfer was chosen from five hundred other boys for the coveted lead role of Alex Rider.
As the lead character of Alex Rider engages in mountain climbing, scuba diving, martial arts and many other extreme sports, the role is said to be one of the most physically demanding ever undertaken by a child actor.
Because Alex Pettyfer was only 15 at the time, he was not allowed to drive the car in the car chase mentioned in the book, so it was instead converted to a horse chase so as the chase could still take place.
BBC News 24 presenter Simon McCoy has a cameo as the newsreader in the film announcing the Stormbreaker computer.
They published an early edition of the script into a book.
The building opposite Alex and Sabina's school is actually the Channel 4 headquarters.
The school scenes were filmed at The Grey Coat Hospital school in Westminster, London, which is actually a girls school.
The water tank holding the Portuguese Man-of-war Jelly-fish was filled with 19,000 gallons of water. The jelly-fish itself was a puppet.
The bridge was closed for an entire day so they could film Alex Rider's bike chase of the white van.