[s1e7] Poisoning The Well -

: The vaccine doesn't just stop the Wraith from feeding; it kills the Wraith who try. However, the Atlantis team discovers a horrifying side effect: the vaccine has a 50% mortality rate among the Hoffan people themselves.

: The story focuses heavily on Dr. Carson Beckett , making it a defining episode for his character. His budding romance with a Hoffan scientist named Perna ends in tragedy when she insists on taking the vaccine herself and subsequently dies. [S1E7] Poisoning the Well

: Despite the lethal risks, the Hoffan government chooses to move forward with a mass distribution of the drug. They view a 50% death rate as a victory compared to the certainty of being culled by the Wraith. : The vaccine doesn't just stop the Wraith

There's No Place Like Terra: A Stargate Podcast Podcast Republic Carson Beckett , making it a defining episode

The episode is celebrated for moving beyond typical sci-fi tropes to deliver a "gut-punch" narrative about the cost of survival: