Robin Williams, obviously when he was alive. Sure, there are great dramatic actors listed here, but show me anything they’ve done that comes anywhere close to Mork and Mindy or Aladdin.

Mork and Mindy to One Hour Photo and seemingly anything else inbetween. He had the greatest range of any actor I’ve ever seen, and it isn’t close. Honorable mention to Tom Hanks. He can do slappy nonsense and great drama, but I still haven’t been satisfied with him as an irredeemable villain.