[Doctor_Who]

I don't get why they couldn't do a real scene with Darth Vader. I mean, no offense to David Prowse, but all you really need to film such a scene is a Vader costume and James Earl Jones to provide the voice.

They had Jones, and that should have been the expensive part, right? I mean, didn't they have any Vader costumes lying around? They had access to the C-3PO and Chewbacca outfits, and even made a few new costumes. It wouldn't be the "proper" Vader without Prowse, but do you really think they would care for a special like this?