Suggestions by @jonahross

Brad Williams

as Mr Mxyzptlk in The Justice League Unlimited

Corey Stoll

as Parasite in The Justice League Unlimited

Adam Copeland

as Mongul in The Justice League Unlimited

Ed Skrein

as Metallo in The Justice League Unlimited

Adam Rodriguez

as Bane in The Justice League Unlimited

LaKeith Stanfield

as Two-Face in The Justice League Unlimited

Kieran Culkin

as Toyman in The Justice League Unlimited

Naomi Scott

as Talia al Ghul in The Justice League Unlimited

David Strathairn

as Martin Stein in The Justice League Unlimited

Josh Lawson

as Captain Boomerang in The Justice League Unlimited

Avantika

as Starfire in The Justice League Unlimited

Viola Davis

as Amanda Waller in The Justice League Unlimited

Michael Rooker

as General Wade Eiling in The Justice League Unlimited

María Gabriela de Faría

as The Engineer in The Justice League Unlimited

Callina Liang

as Jayna in The Justice League Unlimited

Ross Butler

as Zan in The Justice League Unlimited

Dee Bradley Baker

as Detective Chimp in The Justice League Unlimited

O'Shea Jackson Jr.

as Orion in The Justice League Unlimited

Robin Atkin Downes

as Red Tornado in The Justice League Unlimited

Sinqua Walls

as Steel in The Justice League Unlimited