Suggestions by @nolanmassey
3,412 suggestions

An Unknown Child Actor
as Littlefoot in The Land Before Time

Jacob Tremblay
as Littlefoot in The Land Before Time

Andy Serkis
as Petrie in The Land Before Time
Martin Short
as Petrie in The Land Before Time
Ida Lupino
as Writer in Doctor Who: Season 4 (1966 American Version)

Richard Donner
as Writer in Doctor Who: Season 4 (1966 American Version)
Roger Corman
as Producer in Doctor Who: Season 4 (1966 American Version)
Boris Karloff
as The Toymaker in Doctor Who: Season 3 (1965 American Version)

Willem Dafoe
as The Master in What If Doctor Who Wasn't Axed? Season 37 (2000) (American Version)

Ed Wynn
as Cyril in Doctor Who: Season 3 (1965 American Version)
Sterling Holloway
as The Doctor in Doctor Who: Season 5 (1967 American Version)

Robin Williams
as 5th Doctor in Doctor Who American

Hayden Christensen
as The Flash in DC Extended Universe (2003-2013)

Hugh Grant
as Vector Perkins in Despicable Me (2000)

John Cleese
as Dr. Nefario in Despicable Me (2000)

Ben Stiller
as Gru in Despicable Me (2000)

Steve Buscemi
as Gru in Despicable Me (2000)

Darren McGavin
as The Second Doctor in Doctor Who: Season 4 (1966 American Version)
Don Knotts
as The Second Doctor in Doctor Who: Season 4 (1966 American Version)
Dick Van Dyke
as The Second Doctor in Doctor Who: Season 4 (1966 American Version)