This is from back in 2015 and I'd only just became aware of it.
But for heavens-sake... really?!
Wikipedia:
But for heavens-sake... really?!
Quote:'Darth Vader was portrayed by bodybuilder David Prowse in the original film
trilogy, and by stunt performer Bob Anderson during the character's intense
lightsaber fight scenes.
David Prowse.
Lucas originally intended for Orson Welles to voice Vader (after dismissing
using Prowse's own voice due to his English West Country accent, leading
to the rest of the cast nicknaming him "Darth Farmer").
After deciding that Welles's voice would be too recognizable, he cast the
lesser-known James Earl Jones instead.
Jones initially felt his contributions to the films were too small to warrant
recognition and his role was uncredited at his request until the release of
Return of the Jedi (1983).
When Jones was specifically asked if he had supplied Vader's voice for
Revenge of the Sith -either newly or from a previous recording -Jones
answered, "You'd have to ask Lucas about that. I don't know".
The character has also been voiced by Scott Lawrence and Matt Sloan
for several video games. Hayden Christensen and Gene Bryant alternately
portray Vader in Revenge of the Sith...'
Wikipedia:
Edith Head Gives Good Wardrobe.