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In the near future, planet Earth is permanently altered following the sudden—and tumultuous—arrival of seven unique alien races. In the boom-town of Defiance, the newly-formed civilization of humans and aliens must learn to co-exist peacefully.

Earth is visited by an alien species that threatens humanity's existence. Events unfold in real time through the eyes of five ordinary people across the globe as they struggle to make sense of the chaos unraveling around them.

When astronomers detect a transmission from another galaxy, it is definitive proof of intelligent extra-terrestrial life. The world’s population waits for further contact with bated breath. They do not have to wait long. Within days, mankind is all but wiped out by a devastating attack; pockets of humanity are left in an eerily deserted world. As aliens hunt and kill those left alive, the survivors ask a burning question – who are these attackers and why are they hell-bent on our destruction?

Depicting an epic 26th-century conflict between humanity and an alien threat known as the Covenant, the series weaves deeply drawn personal stories with action, adventure and a richly imagined vision of the future.