During an appearance on Jimmy Kimmel Live to promote Avengers: Age of Ultron, Cobie Smulders, who has played Maria Hill since the first Avengers film, let a tiny little detail slip. Agent Maria Hill is headed back to Agents of S.H.I.E.L.D.!
Also worth noting, per Spoiler TV, the season finale of Agents of S.H.I.E.L.D. will be two-hours long (two episodes back to back). I would say it’s safe to expect Hill to return for the finale, but given how well they handled the return of Deathlok, seeing to it that his arrival on screen was a surprise for fans, I wouldn’t be surprised if she showed up before then.
Agents of S.H.I.E.L.D. airs Tuesdays on ABC.