The truth behind Fitz's turn could bring down all of S.H.I.E.L.D..

The team has one final chance to return to the timeline, but their actions may have deadly consequences.

With the identity of the timeline-unraveling "thread" revealed, the team's mission to protect him at all costs leads each agent to question their own values. Is preserving the future of the world as they know it worth the destruction they could prevent?