A new military contingent from Earth is sent through the Stargate to take command of Atlantis and defend it from the impending Wraith attack.

Vince, Eric, Drama, and Turtle are forced to move out of the mansion. Eric moves in with Sloan and Drama wants to get an expensive condo. With "Medellin" getting into the early stages of pre-production, a surprise cast member is asked to direct

Chuck finds a bug in the Buy More, which leads Casey and Sarah to take drastic measures to find out whether the truth about Chuck has been discovered. Whilst facing the possibility that he may have to leave his life forever, Chuck loses something very important- the engagement ring for Ellie entrusted to him by Captain Awesome.

A sense of foreboding surrounds Smallville as Clark must choose between staying with Lana and his family or fulfilling his destiny to rule the Earth. Lex and Helen prepare for their marriage, and Chloe considers Lionel's offer to investigate Clark.

Global Dynamics goes into lockdown to protect itself from the now airborne metal-eating bacteria. Stuck inside GD, Sheriff Carter and Stark must work together to save both the town and Kevin, Alison's son.

Can Sylar be stopped? Will Linderman's vision live on with Nathan? What will it take for Peter to save the world? What sacrifices will be made? With all the horrible predictions unfolding before them, the heroes face moments of pain and peril in Kirby Plaza.