The upcoming documentary Elstree 1976 "explores the lives of the actors and extras behind one of the most celebrated science fiction films in cinematic history: Star Wars." Some of the Star Wars vets interviewed in writer-director Jon Spira's film include David Prowse, Jeremy Bulloch, Derek Lyons, Pam Rose, Paul Blake, and John Chapman.

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Prowse, who portrayed Darth Vader in the original trilogy, recalls in our exclusive clip below how came to learn that Vader's voice would be dubbed by none other than James Earl Jones:Elstree 1976's official synopsis adds that the film looks "at the unheralded stars of George Lucas’s original film - from the man behind film’s most iconic villain, to the actor whose character was completely cut from the final film - the documentary delves into the eccentric community these individuals have formed and how the Star Wars franchise – which spans five decades from A New Hope to The Force Awakens – continues to impact their lives decades later."Elstree 1976 will be in theaters and On Demand on May 6. For more on the film, check out its official site