There’s a good documentary about him
Apparently he spilled the beans on a big plot point of one of the film’s in an interview by accident. George Lucas never forgave him & he was black balled from all future promotional engagements as well as anniversaries.These guys recreated the scene where they remove Vader’s mask & it’s his face instead .
It really upset him that his face wasn’t used originally.
Kind of a redemption moment for Prowess.
If your a fan , really worth a watch .