Season 3 - Episode 17-20.

SUNDAY - With almost every member of the Atlantis expedition ordered to take a day off, the city is jolted by an explosion that rips through a section of the city. Suddenly, it seems, many, many people are in danger.

SUBMERSION - When the team explores alternate power sources beneath the surface of the ocean they discover and inadvertently awaken a Wraith Queen who has been dormant for thousands of years.

VENGEANCE - Colonel Sheppard and his team search for a missing village they helped relocate but in the process they stumble onto a Wraith experiment designed to create Iratus superbugs.

FIRST STRIKE - The Apollo, Earth's newest ship, is sent out to perform a preemptive first strike to stop an attack on Atlantis. When the mission fails, however, Atlantis again sinks beneath the ocean, and it is uncertain whether the ocean will be able to save the city.