Suggestions by @harrybray
9,881 suggestions

Thomas F. Wilson
as Dennis Carradine in Spider-Man

Eric Roberts
as Vought Cinematic Universe in Actors who should join certain big franchises

Gerard Christopher
as Todd Ingram in Scott Pilgrim vs. The World (1987)
Joseph Marcell
as Professor Xavier in Superhero Movie (1988)

James Doohan
as Dr.Strom in Superhero Movie (1988)
Leslie Nielsen
as Lou Landers in Superhero Movie (1988)

Christopher Plummer
as Old Erik Lehnsherr in X-Men: Days of Future Past (1992)
George Lazenby
as Benoit Blanc in Knives Out (1979)

Nicol Williamson
as Gandalf in The Lord of the Rings (1980)

Jeremy Brett
as Vision in MCU Recast (With only late actors R.I.P.)
Alan Young
as Wilt Appleday in Re-Animated (90s)

Michael Palin
as Double-q in Secret squirrel

Dan Castellaneta
as The TV Repairman in Pleasantville
Sammy Davis Jr.
as Oscar in Shark Tale (1964)

Michael Crawford
as Mr Dawes Jr in Mary Poppins Returns (recasting)

Alan Arkin
as Roy Walley in National Lampoon's Vacation (1993)
Katee Sackhoff
as Americans with a bad English accent. in United Kingdom

Hal Linden
as George in The Aristocats
Ed Asner
as Wilfred Mott in What If Doctor Who Was American?
Desmond Llewelyn
as Winston The enigmatic owner of the Continential Hotel in John Wick (1992)