Shadows of Tomorrow 4: War of the Worlds

After the events of Season 3, Ethan Cross discovers that Earth is only one part of a vast galactic conflict. When the ruthless Emperor Zareth launches a campaign to unite the universe under his control, Ethan must lead heroes from different worlds into an unprecedented intergalactic war. As alliances are formed and powerful secrets about the Celestial Guardians are revealed, Ethan faces his greatest challenge yet: defeating an enemy who genuinely believes he is saving the universe. Worlds will unite. Empires will fall. And one Guardian will decide the future of the galaxy.