HALO 4, the Master Chief's first new adventure in five years, picks up right where its predecessor left off, with a broken UNSC ship floating dead in space. The Chief rests inside in cryosleep, the artificial intelligence Cortana holding watch. It's not long, however, before the vessel falls under attack by Covenant forces, and the Chief soon finds himself crashing onto the surface of a strange alien world. The story that follows reveals new details about the Forerunners (the ancient aliens who designed the series' titular halos), exposes a new threat to humanity, and delves into the Chief's close friendship with Cortana, who is suffering a kind of digital mental breakdown. In addition to the six hour campaign, which shows off new weapons and vehicles (including alien rifles and a towering UNSC mech), players can look forward to more of Halo's trademark multiplayer action, including a serialized cooperative campaign composed of new episodes releasing on a weekly basis.