Guest Stars

Craig Veroni As Dr. Peter Grodin Recurring	Paul McGillion As Dr. Carson Beckett Recurring

Co-Guest Stars

David Nykl As Dr. Radek Zelenka Recurring	Dean Marshall As Sgt. Bates Recurring
Lindsay Collins As Dr. Biro Recurring	Allison Graham As Lt. Crown
Damon Johnson As Peterson	Dane MacFahden As Wagner (as Dane B. McFadhen)
Michelle Addison As Johnson	Nahanni Arntzen As Dumais
Peter Grier As Hays

Main Cast

Joe Flanigan As Major / Lieutenant Colonel John Sheppard

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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• Creator	Brad Wright (1)  |  Robert C. Cooper
• Executive Producer	Joseph Mallozzi  |  Paul Mullie
• Music	Joel Goldsmith
• Other	Joel Goldsmith (Main Title Theme)