Justice league message.

Message to Japan.
Cast explains.
Wikipedia, quotes.

• Ben Affleck as Bruce Wayne / Batman:
  The benefactor of the group of meta-humans, a wealthy socialite and the owner of Wayne Enterprises, who also dedicates himself to protecting Gotham City from its criminal underworld as a highly trained, masked vigilante equipped with many powerful tools and weapons.
• Henry Cavill as Kal-El / Clark Kent / Superman:
  A Kryptonian survivor and journalist for the Daily Planet with superhuman abilities, who seemingly died after the events of Batman v Superman: Dawn of Justice. In February 2016, Cavill announced on social media that he had already started exercising for the film in advance of principal photography.^[5]
• Gal Gadot as Diana Prince / Wonder Woman:
  An antiquities dealer and acquaintance of Wayne who is actually an immortal Amazonian warrior princess from Themyscira and daughter of Zeus, who possesses superhuman attributes and abilities inherited from her parents.
• Jason Momoa as Arthur Curry / Aquaman:
  The king of the undersea nation of Atlantis, whose meta-human aquatic abilities and superhuman physical attributes originate from his Atlantean physiology.
• Ezra Miller as Barry Allen / The Flash:
  A Central City police forensic investigator, who can move at superhuman speeds with his ability to tap into the Speed Force.
• Ray Fisher as Victor Stone / Cyborg:
  A former college athlete who, after being cybernetically reconstructed with a Mother Box after a nearly fatal accident, has powers that allow him to manipulate technology and to turn his arms to cannons. Fisher portrays the character through the assistance of motion capture performance, for the cybernetic portion of his body.^[6]
• Ciarán Hinds as Steppenwolf:
  A general of the alien race, the New Gods, from the planet Apokolips who is charged with hunting down the three Mother Boxes on Earth for his nephew and commanding officer Darkseid.^[4][7] The character had previously appeared in the extended Ultimate Edition of Batman v Superman: Dawn of Justice, in which he communicates with Lex Luthor through Kryptonian hologram technology. In March 2017, Ciarán stated that Steppenwolf is old, tired and trying to get out of his enslaved position under Darkseid.^[8] Hinds will portray the villain through use of motion capture performance and received help in that process from his friend Liam Neeson, who had recently done similar work in A Monster Calls.^[9]
• Amy Adams as Lois Lane: An undaunted and compassionate award-winning journalist for the Daily Planet and the primary love interest for Clark Kent / Superman.^[10]
• Willem Dafoe as Nuidis Vulko: An Atlantean advisor to Aquaman.^[11]
• Jesse Eisenberg as Lex Luthor: The hereditary CEO of LexCorp who is incarcerated in Arkham Asylum, following the events of Batman v Superman: Dawn of Justice.^[12][13][14]
• Jeremy Irons as Alfred Pennyworth: Bruce Wayne's butler, chief of security, and trusted confidant.^[15]
• Diane Lane as Martha Kent: Clark Kent's adoptive mother.^[10]
• Connie Nielsen as Queen Hippolyta: Diana Prince's mother and the Amazonian queen.^[10]
• J. K. Simmons as James Gordon: The Commissioner of the Gotham City Police Department and close ally of Batman.^[10]

Joe Morton and Robin Wright reprise their roles from previous films as Dr. Silas Stone, a scientist at S.T.A.R. Labsand Victor Stone's father, and as Amazonian General Antiope, Hippolyta's sister and Diana's aunt/mentor.^[16][17]Amber Heard, Billy Crudup, and Kiersey Clemons will portray Mera, Dr. Henry Allen, and Iris West, respectively.^[10][16] Julian Lewis Jones and Michael McElhatton have been cast in undisclosed roles.

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