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Gears of War takes place on Sera, a planet inhabited by humans, who have warred over a phosphorescent, low-viscosity fluid known as Imulsion, highly valued as a source of energy. Over several decades, the Pendulum Wars took place between various human countries, and ended with the Coalition of Ordered Governments (COG) taking control of the planet. The war quickly came to an end on "Emergence Day", when a ravenous force known as the Locust Horde bursts from underneath major human cities using a network of underground tunnels.

The Coalition, unable to defend against the sudden attack, is routed, and the Locust Horde takes control of the majority of Sera's urban, military, and manufacturing centers within 24 hours. The COG orders any survivors to the Jacinto Plateau, a safe haven from Locust underground attacks due to the composition of the rock it is made of, and then uses orbital laser weapons in a scorched earth strategy to deny the Locust Horde its gains. The human survivors that could not make it become known as the "Stranded" and have to survive on their own. In the 14 years since "Emergence Day", the Locust continue to attack the fortified Jacinto Plateau and force the COG to turn to the infirm, the young, and the condemned to replace their dwindling numbers.