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 Michael McElhatton Black Clad Alpha Lara Decaro School Girl Ryan Zheng Kai Ryan Choi David Thewlis Ares Samantha Win Euboea Lisa Loven Kongsli Menalippe Julian Lewis Jones Ancient Atlantean King John Dagleish Black Clad Beta Francis Magee Ancient King of Men Doutzen Kroes Venelia Brooke Ence Penthiselea Hari James Antiope's Crew Ann Ogbomo Philippus Russell Crowe Jor-El (voice) C. Amanda Maud Waitress Ágústa Eva Erlendsdóttir Young Icelandic Woman Salome R. Gunnarsdottir Singing Icelandic Woman Kristbjörg Kjeld Old Icelandic Woman Ingvar E. Sigurðsson Mayor Chris Courtenay Old Bailey Judge Grace Cookey-Gam Old Bailey Lawyer Mark Arnold Containment Centre Scientist Stewart Alexander College Dean Will Austin MP Guard Kevin Costner Jonathan Kent (voice) (uncredited) Robin Wright Antiope (uncredited) Billy Crudup Henry Allen (uncredited) Joe Manganiello Slade Wilson / Deathstroke (uncredited)