In the Chicago Fire season two episode " A Power Move ," Chief Boden faces intense pressure from Gail McLeod to retire as she threatens to shutter Firehouse 51, leading to a potential health scare for Boden and his resignation. Meanwhile, the crew exposes the mole in their midst, and Shay's emotional instability continues to worsen following a series of traumatic events. You can watch this episode on Apple TV or find episode details on the Chicago Fire Wiki .