JUSTICE LEAGUE:
Henry Cavill as Clark Kent/Superman (leader)
Ben Affleck as Batman/Bruce Wayne (co-leader)
Gal Gadot as Diana Prince/Wonder Woman
Ezra Miller as Barry Allen/The Flash
Jason Momoa as Arthur Curry/Aquaman
Ray Fisher as Victor Stone/Cyborg
Jamie Dornan as Hal Jordan/Green Lantern
Michael Jai White as John Stewart/Green Lantern
Brandon Molale as Shazam/Captain Marvel
LEGION OF DOOM:
Jesse Eisenberg as Lex Luthor (leader)
Joe Manganiello as Slade Wilson/Deathstroke
(Lex Luthor's bodyguard)
Jared Leto as the Joker
Clancy Brown as Gorila Grodd (voice) (co-leader)
Shaun Toub as Ra's Al Ghul
The Rock as Black Adam
Jai Courtney as George Harkness/Captain Boomerang
Jessica Chastain as Barbara Ann Minerva/Cheetah
Yahya Abdul-Mateen II as Black Manta
Adewale Akinnouye-Abgaje as Waylon Jones/Killer Croc
Solomon Grundy (CGI + animatronics)
NOTABLE CAMEOS:
Viola Davis as Amanda Waller
Joel Kinnaman as Lt. Col. Rick Flagg
Margot Robbie as Dr. Harleen Quinzel/Harley Quinn
Michael B. Jordan as Aqualad
(son of Black Manta)
Halle Berry as Mary McCabe/Vixen
J.K. Simmons as Commissioner James Gordon
Amy Adams as Lois Lane
Laurence Fishbourne as Perry White