In an alternate universe, the Justice League, a group of powerful superheroes including Batman, Wonder Woman, and Superman, rule Earth with an iron fist, using brutal methods to maintain order. When a group of scientists are killed in a manner similar to the Justice League's methods, President Amanda Waller asks them to cooperate with the government's investigation. Batman discovers an email that leads him to believe that a project called "Project Fair Play" is involved, and he and the other members of the League are attacked by robot assassins. The League takes Magnus, one of the surviving scientists, to their Tower to recover, while Superman flies to Luthor's satellite orbiting the Moon to confront him. Luthor reveals that Project Fair Play is a way to destroy the League if necessary, and also reveals the truth about Zod to Superman. As Superman leaves, a robot assassin booms in and destroys the satellite, seemingly killing Luthor. The League faces off against troops and vehicles armed with energy weapons powered by red solar radiation, while Batman stays inside the Tower and activates the forcefield. However, Tina appears and subdues Batman before shape-shifting into a liquid metal robot named Platinum and revives Magnus with an organic nanite serum that enhances his strength and healing. Magnus reveals that he had killed Tina in a fit of rage after realizing she was in love with Kirk, and that he orchestrated everything using his Metal Men with the intent to detonate a Nanite Bomb in order to forcefully link humanity together into a hive mind. He joined Fair Play for its resources to fund his secret Nanite Bomb project. As Magnus prepares his weapon, Luthor teleports into the middle of the battle outside and tells everyone he has discovered Magnus' plan. Batman frees himself and seizes the opportunity to drop the forcefield. The League destroys the bomb and defeats Magnus before he can commit suicide by disintegrating himself with nanites as he tells Kirk to forgive him for his actions."

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Some movies that have similar genres and were produced around the same time as Justice League: Gods and Monsters include Fate/stay night: Heaven's Feel II. Lost Butterfly, RWBY: Volume 1, Black Butler: Book of the Atlantic, Legend of the Bone Knapper Dragon [Short], Slugterra: Into The Shadows, Heavenly Sword.

Justice League: Gods and Monsters was released for streaming on July 14, 2015.