While doing so, he and Cortana uncover Halo's dark secret and fight to protect all life in the galaxy. After crash-landing on a mysterious ringworld known as Halo, the Master Chief is tasked with helping the remaining humans survive against the overwhelming Covenant forces. Now optimized for PC, relive the spectacularly remastered edition of the original Halo campaign, created in celebration of the 10th anniversary of one of the most beloved franchises in gaming history. Halo: Combat Evolved Anniversary comes to PC as the second installment of Halo: The Master Chief Collection.