When a team fails to check in with Atlantis while on a mission exploring an anomalous energy spike, Sheppard's team must go in search of the missing men. Arriving on the planet the team immediately discovers the bodies of many dead Genii soldiers. Stranger yet is the fact that they appear to have all killed each other. Still in search of their missing men McKay (David Hewlett) follows the energy readings leading the team to a bunker housing an abandoned wraith experiment designed to manipulate the minds of their prey. Something has gone wrong however and the device, now surging out of control, is causing disturbing hallucinations. Discovering the bodies of the missing Atlantis team it becomes clear that they fell victim to the hallucinations and killed each other. Now with Ronon (Jason Momoa) chasing after wraith that aren't there and Sheppard (Joe Flanigan) believing he's trapped back in horrible flashback to his time in Afghanistan, it's a race for McKay to disable the device...