who are the other characters?
Batman, Wonder Woman, The Flash, Aquaman, and Cyborg, Superman, Steppenwolf , Parademons.
Justice League (film)
 In the film, Batman and Wonder Woman recruit The Flash, Aquaman, and Cyborg after Superman's death to save the world from the catastrophic threat of Steppenwolf and his army of Parademons.
whose at the end of justice league trailer Clark Kent was revealed in a final trailer before the release of the film. what is the storyline? Steppenwolf and his legions of Parademons had attempted to take over the Earth using the combined energies of the three Mother Boxes.
wiki:4829082
Justice League (film) [SEP] Introduction
Justice League is a 2017 American superhero film based on the DC Comics superhero team of the same name. It is the fifth installment in the DC Extended Universe and a follow-up to "", and was directed by Zack Snyder and written by Chris Terrio and Joss Whedon who served as co-director, based on a story by Terrio and Snyder. It features an ensemble cast that includes Ben Affleck, Henry Cavill, Gal Gadot, Ezra Miller, Jason Momoa, Ray Fisher, Amy Adams, Jeremy Irons, Diane Lane, Connie Nielsen, and J. K. Simmons. In the film, Batman and Wonder Woman recruit The Flash, Aquaman, and Cyborg after Superman's death to save the world from the catastrophic threat of Steppenwolf and his army of Parademons.