Actors who were as good as it could get for whatever role they played

I see Sam Neill from Jurrasic Park died. I've seen him in some stuff, great actor, he was perfect as Dr Grant. I thought it'd be a good excuse for this thread in his honor.

I'd have to go Viggo Mortensen for Aragorn, I really don't think you could have a better guy cast in that role. He was badass as fuck in that. Big fan. I was actually reading up on it he was like a last minute emergency back up plan for Aragorn in the Lord of the Rings after they fired the original dude. Stuart Townsend was his name, the guy from the Queen of the Damned movie. I mean thank God they fired that guy, he looks like a boyband backstreet boy dude, he would have RUINED that franchise. I heard they also offered it to Russel Crowe and Nick Cage, they even talked about Vin Diesal! I don't see any of that working. Anyway it almost didn't happen but maybe I think this ended up being the best casting decision all time.

What do you guys got? TV, Movies whatever.