Robert Downey, Jr.

Robert Downey, Jr. is one of the best actors of his generation. And yet, he's almost blown it on numerous occasions--he has been given more second chances than most people get - even by Hollywood standards. This, of course, must be attributed to his immense talent...who hasn't wanted to see him make a comeback when his chips, in the past, have been down? And, comeback kid he's been over the past few years with brilliant performances in blockbuster successes like "Iron Man" and "Tropic Thunder".

Here's hoping we continue to see more great work from him for many, many years - he's such an interesting actor that his performance alone can make a mediocre film watchable.

Take a look here at his highs and lows over the years.