"What They Become" is the tenth episode and mid-season finale of the second season of the American television series Marvel's Agents of S.H.I.E.L.D., or simply Agents of S.H.I.E.L.D., based on the Marvel Comics organization S.H.I.E.L.D. (Strategic Homeland Intervention, Enforcement and Logistics Division), a fictional peacekeeping and spy agency in a world populated with superheroes and numerous supernatural phenomena.