Part 2 — [s1e20] The Siege:

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.

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

When the Naquadah generator fails, Sheppard takes a Puddle Jumper on a manual kamikaze run to detonate a nuke inside a Hive ship. [S1E20] The Siege: Part 2

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: The "cavalry" isn't without its costs

Everett is cornered and fed upon by a Wraith, while Lt. Aiden Ford is caught in an explosion that hurls him into the sea.

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"The Siege: Part 2" perfectly encapsulates the high stakes of Atlantis , leaving viewers wondering if the expedition's survival was even possible.