The Master Chief stows away on a vessel headed to Earth, in the midst of a full-scale invasion by the Covenant, who excavate a Forerunner artifact in the African desert. The artifact creates a slipspace portal leading to the Ark. The Master Chief and Arbiter travel through the portal to kill the last High Prophet, Truth, and discover the installation is building a new ring to replace the one destroyed previously. In order to destroy the spreading infestation led by the Flood intelligence Gravemind, the Master Chief activates the incomplete ring—as the Ark lies outside the Milky Way, the blast will destroy the Flood and spare the galaxy at large. Because the ring's construction is incomplete, the resulting pulse destroys the ring and damages the Ark. The Arbiter escapes the explosion, but the Master Chief and Cortana are left drifting in space, trapped in the severed rear half of their ship. The Master Chief cryonically freezes himself as he and Cortana wait for rescue. In a bonus ending, the ship is seen drifting towards a mysterious planet.

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