In 60 parsecs there should be a planet like earth but overrun by zombies. the zombies look humanoid so this implies that human like creatures used to live there. on a mission the zombies can capture your crew mate and turn them into zombies. there could be an ending where your zombified team mate tells the zombies where your ship is and you all get eaten. The good endings could be where you manage to contact with a survivor and they let your team into their bunker or where you cure the zombies and they elect you as their new leader.