Suggestions by @castingsinmyblood

Naamah (Noah (2014))

as Ayelet Zurer in What if this actor played

Cosmic Boy (DC Comics)

as Steven Yeun in What if this actor played

Tubal-Cain (Noah (2014))

as Brian Cox in What if this actor played

Brian Cox

as Tubal-Cain in Noah (90's version)

Thaal Sinestro

as Tony Curran in What if this actor played

Inspector Cramer

as Brian Dennehy in What if this actor played

Meowth

as Marty Feldman in What if this actor played

Luca Brasi

as Brad Garrett in What if this actor played

Alexander Corvinus

as Jonathan Pryce in What if this actor played

Mr. Dark

as Jared Leto in What if this actor played

Wolverine (James "Logan" Howlett)

as Sean Penn in What if this actor played

Gríma Wormtongue

as Stephen Rea in What if this actor played

Alex Rochon

as Morgan Edge in My very own Superman Animated Series

Tawky Tawny

as Dom DeLuise in What if this actor played

Juror #2 (12 Angry Men)

as John Cazale in What if this actor played

Perry White

as James Earl Jones in What if this actor played

Todd Capybara

as Thurop Van Orman in Best VOICE ACTORS' Roles

Gilbert Gottfried

as Tim The Guard in Robots (1985)

Martha Kent

as Susan Sarandon in What if this actor played

The Cat in the Hat (character)

as Gene Wilder in What if this actor played