Stargate Atlantis (2004)

S2E13 Critical Mass

A member of the Trust has secretly placed a bomb in Atlantis, prompting the team to race against time to uncover a mole within their own ranks. As the Wraith draw closer to the city, tensions rise, and the urgency to identify the traitor intensifies. With the safety of Atlantis hanging in the balance, the team must navigate internal mistrust and external threats to prevent a catastrophic disaster before it's too late.