Suggestions by @castingsinmyblood

Thor Odinson

as David Yates in If this Director directed...

Perry White

as Rip Torn in What if this actor played

Metallo (John Corben)

as Greg Kriek in What if this actor played

Cowardly Lion (Oz)

as Harvey Fierstein in What if this actor played

Victor Frankenstein

as David Oxley in What if this actor played

Vanessa Fisk

as Monica Bellucci in What if this actor played

Sallah Mohammed Faisel el-Kahir

as Omar Sharif in What if this actor played

Jor-El

as Sean Bean in What if this actor played

Ganthet

as George Takei in What if this actor played

Abin Sur

as Yul Brynner in What if this actor played

Thaal Sinestro

as David Niven in What if this actor played

Rick Santoro

as Jack Quaid in What if this actor played

Noah Cross

as John Lithgow in What if this actor played

Alberto Falcone

as John Turturro in What if this actor played

Lex Luthor (Gene Hackman)

as Harvey Korman in What if this actor played

Bilbo Baggins

as Peter Sallis in What if this actor played

Obi-Wan Kenobi

as Toshiro Mifune in What if this actor played

George Bailey

as Don Cheadle in What if this actor played

Dr. Zaius (Planet of the Apes)

as Anjelica Huston in What if this actor played

Gimli

as Aldo Ray in What if this actor played