Frost is a severly disturbed man who thinks that the world is hell and needs to start again to be made better. He intended to accomplish this by blowing up Chicago with a nuclear bomb he had made himself. Frost then intended to further do more acts of terrorism which would presumably result in the destruction of many more cities and possibly millions more lives. Frost was sucessful in destroying a train he had left his wallet in so everyone would think he had died with everyone else on-board. However, thanks to the highly advanced scientific creation called "Source Code" which enables an almost dead person to live the last eight minutes of a deceased persons life, Capt. Colter Stevens was able to stop Derek from setting off his second bomb. Captain Stevens accomplished this by revisiting t