Despite only actually starring in one MCU film, Hayley Atwell has been one of the most welcome staples in the MCU, having appeared several times in the universe since Captain America: The First Avenger. Her show Agent Carter was so well-beloved that fans are still clamoring for its return. And while it’s unlikely we see a full iteration of the show in the near future, it seems we may be seeing her in the final season of Agents of S.H.I.E.L.D., at least according to Fandomwire.
The finale of Agents of S.H.I.E.L.D. ended in a huge way when the team was transported back in time to what is presumably the 40s. With the show ending and the lack of closure for Agent Carter, I could see the writers using the final season to bring both shows to a satisfying conclusion. Or Peggy and her friends could appear in just a brief appearance. Either way, having Atwell back to reprise her role as Peggy is never a bad thing.