Ben Affleck Bruce Wayne / Batman Henry Cavill Clark Kent / Superman / Kal-El Gal Gadot Diana Prince / Wonder Woman Jason Momoa Arthur Curry / Aquaman Ezra Miller Barry Allen / The Flash Ray Fisher Victor Stone / Cyborg Amy Adams Lois Lane Jeremy Irons Alfred Pennyworth Connie Nielsen Queen Hippolyta Diane Lane Martha Kent J.K. Simmons Commissioner James Gordon Ciarán Hinds Steppenwolf (voice) Amber Heard Mera Joe Morton Silas Stone Ray Porter Darkseid (voice) Jesse Eisenberg Lex Luthor Jared Leto The Joker Willem Dafoe Nudis Vulko Kiersey Clemons Iris West Peter Guinness DeSaad (voice) Harry Lennix General Calvin Swanwick / J'onn J'onzz / Martian Manhunter Karen Bryson Elinore Stone Marc McClure Jerry Sergi Constance Zeus Samantha Win Euboea Francis Magee Ancient King of Men Vincent Riotta CID Chief Detective Stewart Alexander College Dean Sam Benjamin Military Police Robin Wright Antiope (uncredited) Joe Manganiello Slade Wilson / Deathstroke (uncredited)