J’onn J’onzz and his wife examine the Heavens while their daughter does some drawings on a rock wall somewhere on Mars. J’onn teases her, and, in the process of discussing life on other worlds, he loses a lens that he needs. As he picks it up, he sees the designs that his child had created. They are symbols that seem strangely familiar to him.
Superman and Batman are searching for their comrades. Batman has made an appointment to meet Arthur Curry as Bruce Wayne, while Superman will talk to Diana Prince as Clark Kent. Both are unaware that Doctor Destiny has been responsible for the Sparks all over the world. He is attached to a device that seems to make dreams into reality by amplifying his telepathic abilities. Meanwhile, Wally West, convinced that his recent nightmares are somehow connected to the Green Lantern comic book, has taken a flight to New York City to speak with the writer/artist Kyle Rayner. All of these people, including Doctor Destiny, are pawns of the mysterious Know Man. What isn’t realised yet is that everyone involved is going to be part of a great adventure.
Arthur Curry believes Bruce Wayne is insane. He clearly doesn’t believe Wayne’s claims that Curry is the king of Atlantis. In response to Arthur’s scepticism, Bruce pushes Arthur’s face into a fish tank. Being submerged in the water makes him remember his life as Aquaman. Now, all he has to do is meet Superman and Batman at the Empire State Building tonight at 9:00 PM. Only there, can he learn the truth about what has happened to the world.
As Know Man recruits the super-powered woman called Onyx, Kyle Rayner meets Wally West, whom Kyle mistakenly thinks he is a stalker. Wally has had dreams that feature characters exactly like those on the paper on Kyle’s art table, and West wants to know how he and Rayner are connected. Kyle clearly doesn’t know the answers to Wally’s questions. Both men are becoming agitated. Suddenly, a bolt of green light is fired from Kyle’s right fist. Wally moves at very high speeds to avoid being hit by the energy blast.
Sparker violence is increasing all over the world. Know Man is enjoying every minute of the chaos.
Clark Kent has found Diana Prince, who mistakes his need to reveal the truth to her as a pick up line. She has become confused after she crushes a statue with her bare hands. Superman reassures her as she and he both float off a ledge of the Themyscira School For Girls. Diana finally remembers herself as Wonder Woman.
Superman, Wonder Woman, Batman and Aquaman meet at the Empire State Building as scheduled. They know that Doctor Destiny has altered reality with his telepathic dream powers. J’onn J’onzz, the Martian Manhunter, is the only one who can undo what Destiny has done. Unfortunately, nobody has had any luck in finding him. Suddenly, a metahuman turf war breaks out. Despite Batman’s protests, the heroes takes on the Sparkers. They are outnumbered and outgunned until Green Lantern and the Flash arrive. The riot has been stopped and J’onn must be found; in which Superman has an idea where he is.
J’onn J’onzz has been living a lie. Instead of being on Mars, he has been trapped in an illusion created by Doctor Destiny and Know Man. The dream is interrupted by Superman, who, along with the other heroes, is trying to tell J’onn the truth. He has been kept in an U.S. Air Force base’s hanger located in Roswell, New Mexico. J’onn doesn’t want to believe, but he is eventually angered by the deception. However, before he can act on his rage, Know Man’s seven recruits, including Onyx, Vigil, Behemoth and Unity confront the recently awakened Martian and his friends. The compound is then engulfed in flames and J’onn is forced to watch his family die once again. Now injured and grieving, the Martian Manhunter intends to join Superman, Batman, Wonder Woman, the Flash, Green Lantern and Aquaman. Then, and only then, can they show Doctor Destiny, Know Man and the rest of the world the true power of the Justice League.