Stargate Atlantis (2004)

S2E6 Trinity

In the episode "Trinity," McKay endangers the team by attempting to refine incomplete Ancient technology responsible for the annihilation of an entire civilization. Meanwhile, Ronon Dex uncovers that he is not the sole survivor from his home planet, revealing a deeper connection to his past. As the team grapples with these revelations, they must confront the consequences of McKay's actions and the implications of Ronon's discovery.