Suggestions by @ringothedrummer

Ralph Ineson

as Smaug in The Hobbit

Taron Egerton

as Bilbo Baggins in The Hobbit

Graham McTavish

as Thorin Oakenshield in The Hobbit

Guillermo del Toro

as Director in The Hobbit

Willem Dafoe

as Gandalf the Grey in The Hobbit

Lewis Pullman

as Bizarro in Superman

Lewis Pullman

as Superman in Superman

Connor Swindells

as Bizarro in Superman

Kyle Allen

as Bizarro in Superman

Wolfgang Novogratz

as Bizarro in Superman

Stephen McKinley Henderson

as Jonathan Kent in Superman

Emma D'Arcy

as Brainiac in Superman

Cedric the Entertainer

as Perry White in Superman

Karl Urban

as Lobo in Superman

Jim Carrey

as Dr. Dabney Donovan in Superman

Dave Bautista

as Darkseid in Superman

Cameron Britton

as Toyman in Superman

Martin Short

as Mister Mxyzptlk in Superman

Dominic Sessa

as Jimmy Olsen in Superman

Monica Barbaro

as Lois Lane in Superman