That was a smart way to get him to come back. He plays someone like himself, so the disease isnt a problem.
Hope its good. It was a shame to see him taken from us after Back to the future (yeah he was on Sin city aswell but eventually had to leave). He could've been alot more if not for it. Its a real shame. When i look at his face now it reminds me of Tom cruise lol. I think they look misteriously alike.