Recap
The episode starts with Dr. McKay and his team (Dr. Zelenka, Lt. Ford, and Dr. Hayes) playing a game of guessing if a given number is a prime number or not. They are one of the teams checking the city for damage after being hit by a major storm (see episodes The Storm and The Eye). McKay reports to Dr. Weir that the pier section they are inspecting is engineeringly sound, if not dark and stinky. As they have met up with other team members and are about to head back, Zelenka notices that two team members are missing (Wagner and Johnson). McKay calls them on the radio, only to hear them yell they need backup...
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