James Earl Jones is the well-known voice of Darth Vader, nevertheless it was David Prowse who was underneath the helmet on set. Throughout the filming of The Empire Strikes Again, Prowse allegedly leaked 9 separate tidbits to the press in regards to the film, per Empire. In flip, George Lucas cleverly determined to not give him the “I’m your father” line in the course of the historic scene. As an alternative, he stated “Obi-Wan Kenobi is your father” to Mark Hamill.