I never watched an X-men, nor the old Dune, so for me Patrick Stewart is Jean-Luc Picard.

Sarah Michelle Gellar will always be Buffy Summers to me.

Roger Moore as Bond - he wasn't the best Bond, just that he played that character for like 30 years, starting with The Saint in the 60's.

Once you see him there, it's hard to see him as anything else.

William Shatner and Leonard Nimoy as Kirk and Spock in the early Startrek films and series.

Lucy Lawless will forever be Xena the Warrior Princess.

Norman Reedus with forever have "and the funky fetus" after his name because of Death Stranding.

Since 1995, I’ve always associated Ian McKellan with his iconic portrayal of Richard III.

Which colored my impression of Lord of the Rings a bit.

Mac from IASIP. Saw his picture with his son and immediately got thinking 'place away this psycho from a child'

Danny Trejo is of course Machete (or Uncle Machete to the Spy Kids) - even if he does occasionally rangle Rancors or other roles.

(But only when I can see him. I had no idea he had that many voice roles until looking him up just now)

Jaleel White is forever Steve Urklel.

Alfonso Ribeiro is Carlton.

Idris Elba and Dominic West will always be Stringer Bell and Jimmy McNulty for me.

Daniel Radcliffe.

After seeing Swiss Army Man, I can never not see him as a useful corpse. He nailed that role.

Ian McKellan is Gandalf, and I will fight anyone to the death who disagrees.

David Dastmalchian will always be Joker's thug/Fake Cop from The Dark Knight.

Ryan Reynolds Van Wilder

david thewlis' role in fargo! /season 3, just so good!

Young Guns will forever in my head have Jack Bauer in a leading role.

Kind of obscure, but Brits of a certain age will always think of Alan Dale as "Jim from Neighbours". Another one being Guy Pearce as "Mike from Neighbours". Pearce has had a slightly bigger career than Dale maybe, but you've almost certainly seen them both in popular movies and TV shows.

Peter Lustig. But he also played himself and had full power over his show.

Martin Freeman as Bilbo

Til Schweiger as his arrogant asshole self

Everyone from the Friends cast

Dude, Walter, Donnie and the Jesus from The Big Lebowski. Whenever I see Turturro play any other role, he's so bland and normal.

Machlenny, Glenn, Kaitlyn from isaip, they just aren't good outside of the show. Also rob is pretentious as fuck. Typecasting is pretty much a curse for people like these

Prince will always be, for me, the guy who played Prince in Purple Rain.

Claire Foy as Lady Percy in the Upstairs, Downstairs reboot. Seeing her play the queen just felt so wrong, lol.