Coulson's doppelganger takes advantage of his "Window of Opportunity" when getting what he wants. The Sarge and his mysterious cohorts kill and steal while SHIELD follows their tracks. First, the bad guys look for the 'PEGs' that were lost when their teammate Tinker was killed. They think they'll find what they need at a jewelry store where they take the clerk hostage as she gives them access to the vault. May and Yo-Yo follow the clues (and trail of dead bodies) until they have them cornered, but locked in the vault. May realizes that they must have another way out and discovers the portal that transports them to their hideout. A fight ensues, but both she and the Sarge hesitate when Coulson's name is brought up, allowing them to get away before they execute their plan. And Dr. Benson discovers that the plan may involve destroying the planet. Plus, Fitz and Enoch have their cover blown on the alien spaceship where they are working and have to manipulate the captain to save both their lives and the lives of the crew. Jay and Josh try to talk themselves out of an opening airlock on this week's Agents of S.H.I.E.L.D.: Case Files.