UnScramble this Word: r e t a h b e?

Questions

In 'star wars', who was darth vader's voice?

In 'star wars, four people played darth vader david prowse was his body, james earl jones did the voice, sebastian shaw was his face and a fourth person did the ______?

In 'star wars, james earl jones was darth vader's ______?

In 'startrek', who did leonard nimoy play?

In 'startrek', who did william shatner play?