Suggestions by @legendhero

Henry Cavill

as Clark Kent/Superman in Justice League

David Thewlis

as Ares in Wonder Woman

Danny Huston

as Erich Ludendorff in Wonder Woman

David Thewlis

as Sir Patrick Morrison in Wonder Woman

Connie Nielsen

as Hippolyta in Wonder Woman

Chris Evans

as Steve Trevor in Wonder Woman

Gal Gadot

as Diana Prince/Wonder Woman in Wonder Woman

Patrick Wilson

as Ocean Master in Aquaman

Nicole Kidman

as Atlanna in Aquaman

Randall Park

as Dr. Stephen Shin in Aquaman

Temuera Morrison

as Tom Curry in Aquaman

Willem Dafoe

as Nuidis Vulko in Aquaman

Emilia Clarke

as Mera in Aquaman

Alan Ritchson

as Arthur Curry/Aquaman in Aquaman

Eminem

as Leonard Snart/Captain Cold in The Flash

Anna Kendrick

as Golden Gulider in The Flash

Jessica Alba

as Nora Allen in The Flash

Tom Cavanagh

as Harrison Wells in The Flash

Viola Davis

as Amanda Waller in The Flash

Tobey Maguire

as Henry Allen in The Flash