[s1e20] The Siege: Part 2 Apr 2026

The tide seemingly turns when Colonel Dillon Everett arrives with a company of Marines and heavy artillery originally intended for Earth's battlecruisers. This military reinforcement brings hope in the form of:

With the Wraith overrunning the city, Weir is forced into a hostage situation with the Genii to trade for prototype nuclear weapons. Back at Atlantis, Rodney McKay and Radek Zelenka work through exhaustion to complete the unfinished Genii bombs. The episode concludes on a gut-wrenching cliffhanger: [S1E20] The Siege: Part 2

The first season finale of Stargate Atlantis , " The Siege: Part 2 ", remains one of the most intense hours in the franchise's history. Just as the expedition prepares for their darkest hour —arming a self-destruct virus and preparing for a total evacuation—a literal light appears at the end of the tunnel: the Stargate activates with an incoming IDC from Earth. The Arrival of the Cavalry The tide seemingly turns when Colonel Dillon Everett

A Mark II Naquadah generator used to finally activate the Ancient Control Chair, though the city's drone supply is revealed to be critically low. Friction and Failures The episode concludes on a gut-wrenching cliffhanger: The

A new Deep Space Carrier carrying a recovered Zero Point Module (ZPM) that could finally power the city's shields.

Railguns and Naquadah-enhanced nuclear mines deployed to intercept the approaching Wraith Hive ships.

The "cavalry" isn't without its costs. Colonel Everett immediately clashes with Dr. Elizabeth Weir and John Sheppard, holding a personal grudge against Sheppard for the death of Colonel Marshall Sumner.