Iron Man

Genius, billionaire, and playboy Tony Stark, who has inherited the defense contractor Stark Industries from his father, is in war-torn Afghanistan with his friend and military liaison Lieutenant Colonel James Rhodes to demonstrate the new "Jericho" missile. After the demonstration, the convoy is ambushed and Stark is critically wounded by one of his own company's rocket-propelled grenades. He is captured and imprisoned in a cave by a terrorist group, the Ten Rings; Yinsen, a fellow captive who is a doctor, implants an electromagnet into Stark's chest to keep the shrapnel shards that wounded him from reaching his heart and killing him. Ten Rings leader Raza offers Stark freedom in exchange for building a Jericho missile for the group, but Tony and Yinsen agree Raza will not keep his word. Read more on Wikipedia.