The Death Ray hub is a location on board Mothership Zeta.
From where you teleport in, follow the corridor and to the left is a small room, use the terminal next to the door to open it. Within this room is a container and a support drone. The drone can be rewired and activated so that it targets enemies of the player.
A U-turn to the right from the teleporter leads to a room symmetrical to the other small one, also containing a support drone. This drone may also be rewired and activated to provide useful support to the player. Several aliens will be coming from the only door left coming from this room. Follow this path to come into a large room. There is a healing archway, and to your right is a turret terminal that can be used to disable the nearby turret.
Continue following the fairly linear path. There are not many alien enemies,but lots of alien workers. The workers can be avoided or killed, depending on whether or not you want the bad Karma. This eventually leads to the Death Ray control door.