Anakin, He is Your Voice
James Earl Jones was the one who voiced the creepy voice of Darth Vader. David Prowse was actually the guy who played the character in the movie, and during shooting, he spoke all of Vader’s lines, not knowing that James Earl Jones was the voice that would eventually be used in the film until he saw it during the screening itself.
Additionally, Sebastian Shaw was the one who played Anakin Walker in "Return of the Jedi", while Hayden Christensen played the young Anakin in the prologue trilogy.