Suggestions by @ringothedrummer

Mike Faist

as The Flash in Justice League

Mahershala Ali

as The Martian Manhunter in Justice League

Melissanthi Mahut

as Wonder Woman in Justice League

Alden Ehrenreich

as Batman in Justice League

Lewis Pullman

as Superman in Justice League

Starro

as “The Conqueror” in Green Lantern Corps

Spoiler

as “The Conqueror” in Green Lantern Corps

Glenn Close

as Sayd in Green Lantern Corps

Jeremy Irons

as Appa Ali Apsa in Green Lantern Corps

Stephen McKinley Henderson

as Ganthet in Green Lantern Corps

Ken Watanabe

as Abin Sur in Green Lantern Corps

Alan Tudyk

as Ch’p in Green Lantern Corps

Ritu Arya

as Katma Tui in Green Lantern Corps

Ving Rhames

as Kilowog in Green Lantern Corps

Stephen Merchant

as Tomar-Re in Green Lantern Corps

John Boyega

as John Stewart in Green Lantern Corps

Sterling K. Brown

as Thaal Sinestro in Green Lantern Corps

Spencer Wilding

as The Manhunters in Green Lantern Corps

David Tennant

as Larfleeze in Green Lantern Corps

Emma Mackey

as Carol Ferris in Green Lantern Corps