Fitz (Iain De Caestecker) helps Simmons (Elizabeth Henstridge) remember who he is and how they got here: the timestream, the life they lived together, and the implant that separated them. From 'What We're Fighting For,' the series finale of Marvel's Agents of S.H.I.E.L.D. Watch Marvel's Agents of S.H.I.E.L.D. on ABC, streaming, on demand, and Hulu.streaming, on demand, and Hulu.