If you subscribe to Netflix, check out the documentary "I Am Your Father" which is about David Prowse and his role as Darth Vader.
"Our story begins when a young filmmaker travels to London to propose that David Prowse reshoot a sequence from the legendary trilogy. A sequence he couldn't shoot thirty years earlier and which deprived him from being as well known as the other leading members of the cast, such as Harrison Ford, Carrie Fisher or Mark Hamill. The goal is to repair an injustice for the thousands of fans who believe that David Prowse should have played Darth Vader in that particular scene. In a symbolic way, the director, assisted by a group of enthusiastic fans, will try to give Prowse back the recognition he never had.
In this documentary, the directors will find some clues about the difficult relationship between David Prowse and Lucasfilm. Apparently, the reason of for their differences was an article published by a British newspaper during the shooting of "The return of the Jedi". Was the article the only reason why David Prowse has been ostracized all these years?. It's time to find the truth about this, as we try to convince David Prowse to play , one the last time, the most well known villain of all time."
For more info check out the official site.