The film follows a documentary crew sent to record the daily lives of the soldiers of Outpost 37, 12 years after the initial alien invasion.

In 2021, aliens called "Heavies" invade Earth and make quick gains against a disorganised response from various nations.

Local villagers assault the outpost, and a soldier explains they had no problems until recently when he believes that the continued violation of their sovereignty has soured relations.

Their requests for supplies are denied, but they receive a replacement for the injured soldier in the form of Hans, a German national who volunteers to serve with the primarily American group.

Concerned that the Heavies have changed their tactics to include ambushes and abductions, the captain leaves the base to discuss the situation with his superiors.

The captain is furious when he returns; he executes the Heavy and demands they cease their attempts to save North, an action that violates orders.

Several soldiers fall back into the structure under fire from mind-controlled locals and Heavies, where they discover the contractors and several missing villagers.

The remaining journalist reveals that the structure was designed to defeat the USDF satellite system and allow resupply of the Heavies.

A short scene after the credits shows many of the survivors of Outpost 37 with advanced prosthetics as they engage in an all-out fight against a second invasion.

[3] Frank Scheck of The Hollywood Reporter called the plot "an excuse for the video game-style military mayhem which springs up periodically".