How Robert Downey Jr. became a superhero from Bad Boy

As a young talent, he sinks into the drug swamp and ends up in prison.

There was a time when many doubted he would live to see the light of day. But now, at 60, actor Robert Downey Jr. is one of Hollywood's biggest stars. His life journey, marked by drugs since childhood and defined by personal relationships, could well be the subject of a movie.