When Sheppard leads a team to find another overdue off-world team, they find the team members are all dead, except for their C.O., who is still missing. They’ve all been shot numerous times with their own weapons. They also find the decaying remains of several Genii soldiers, who have also died violent deaths, some months before. When Sheppard’s team try to return to Atlantis with their dead, they find the DHD has been rigged to explode, which leaves them stranded on this dangerous planet. It appears that an unusual device they have found, which is emitting strange EM pulses, may be the cause of the hallucinations they are all starting to have. However, can they fight off these hallucinations which were the cause of their comrades’ deaths, long enough for McKay to figure out how to turn off the mysterious device?