Suggestions by @Jeshisthename

Brian De Palma

as Director in Marty Supreme (1995)

Shelley Duvall

as Sif Actress in Thor: Ragnarok {1977}

David Warner

as Surtur in Thor: Ragnarok {1977}

Eric Idle

as Thor Actor in Thor: Ragnarok {1977}

John Cleese

as Loki Actor in Thor: Ragnarok {1977}

John Neville

as Odin Actor in Thor: Ragnarok {1977}

Sarah Douglas

as Hela in Thor: Ragnarok {1977}

Julie Christie

as Hela in Thor: Ragnarok {1977}

Jonathan Pryce

as Grandmaster in Thor: Ragnarok {1977}

Mako

as Hogun in Thor: Ragnarok {1977}

Alan Alda

as Fandral in Thor: Ragnarok {1977}

Oliver Reed

as Volstagg in Thor: Ragnarok {1977}

Terry Jones

as Korg in Thor: Ragnarok {1977}

John Hurt

as Doctor Strange in Thor: Ragnarok {1977}

Laurence Olivier

as Odin in Thor: Ragnarok {1977}

Richard Dreyfuss

as Bruce Banner in Thor: Ragnarok {1977}

Geoffrey Holder

as Heimdall in Thor: Ragnarok {1977}

Jon Finch

as Loki in Thor: Ragnarok {1977}

Rutger Hauer

as Thor in Thor: Ragnarok {1977}

Terry Gilliam

as Director in Thor: Ragnarok {1977}