Robert Downey Jr.
Many people who only know Robert Downey Jr. for his work as Iron Man may not realize how big of a shock it is that the man is even alive today. In the early ’90s Downey was one of the biggest stars in Hollywood, but severe drug addiction seemed intent on doing him in. Addicted to everything you could smoke, or drink, Downey ended up going to prison for his demons. A stint in rehab and the steadfast support of his wife has kept him clean and working and unsurprisingly he is once more one of the biggest icons in Hollywood. You can see him playing a lead role in multiple huge franchises.