Robert Downey Jr has said prison was "the most dangerous place" he's ever been after he spent a year behind bars amid his drug addiction.
The 58-year-old actor was just six years old when he took drugs for the first time, which turned out to be the first step on his path to addiction and prison.
From 1996 through to 2001, the Marvel star was arrested a number of times on charges relating to drugs such as cocaine, heroin, and marijuana.
