Sector Zero is a location in The Lost Frontier. A remote part of the planet all but destroyed by a mysterious vortex and haunted by ghosts, this place has become known as a ship graveyard for its abundance of debris tumbling about in the sky as if there were no gravity. When Jak and Keira find the second coordinate sphere for their eco seeker, they discover a third sphere to be retrieved at the Sector. However, as Jak emerges from the vortex the group is ambushed by the once-ally-turned-adversary Duke Skyheed, manning his newly-equipped battleship the ACS Behemoth.