Suggestions by @alantiedman

Finn Wittrock

as Nightwing in DC

Andrew Scott

as Lex Luthor in DC

Logan Lerman

as Red Robin in DC

Cameron Monaghan

as Joker in DC

Willem Dafoe

as Joker in DC

Scott Adkins

as Batman in DC

Samara Weaving

as Harley Quinn in DC

Bryce Gheisar

as Robin in DC

Billy Zane

as Ian Karkull in Justice Society of America Fan Cast

Benedict Cumberbatch

as Ultra Humanite in Justice Society of America Fan Cast

Sam Heughan

as Doctor Fate in Justice Society of America Fan Cast

Lou Ferrigno Jr.

as Hourman in Justice Society of America Fan Cast

Adrien Brody

as Sandman in Justice Society of America Fan Cast

Luke Hemsworth

as Doctor Midnite in Justice Society of America Fan Cast

Derek Theler

as Hawkman in Justice Society of America Fan Cast

Rachel McAdams

as Black Canary I in Justice Society of America Fan Cast

Colin Salmon

as Red Tornado in Justice Society of America Fan Cast

Garrett Hedlund

as Green Lantern in Justice Society of America Fan Cast

Alan Ritchson

as Wildcat in Justice Society of America Fan Cast

Milo Gibson

as Black Adam in Justice Society of America Fan Cast