[s4e13] Quarantine -

: The team must regain control of the computer systems to override the countdown before the city is destroyed. Key Character Developments

: Stuck in the infirmary. Ronon injures himself further by trying to pry open the doors with an IV pole, leading to a tense bonding moment as Keller treats him. The Climax & Resolution [S4E13] Quarantine

: Trapped in the botany lab. McKay is about to propose with a diamond ring when the lockdown occurs. Due to his nervous nature, he eventually convinces himself he has contracted a fatal contagion. : The team must regain control of the

: Locked in McKay’s personal lab. They discover the city has malfunctioned and is broadcasting a distress beacon that could reveal Atlantis's location to the Wraith. The Climax & Resolution : Trapped in the botany lab

: To stop the distress beacon, Sheppard performs a dangerous external climb up the side of the city's central spire to reach the control room.

: When Sheppard breaks a window to enter the control room, the city interprets the breach as a quarantine violation and initiates a self-destruct sequence.