Agents Of SHIELD Season 4: 15 Characters Who Need To Return
5. Peggy Carter
Last Seen: Interrogating the man who would become Daniel Whitehall, Werner Reinhardt, in flashbacks during season two's 'The Things We Bury'.
Though we haven't seen Peggy since the second season, it's not the last we've seen of her in the MCU, the character most notably carrying her own show for two seasons before it all ended early last year.
As fans of Agent Carter can attest, there's a painful lack of resolution thanks to a cliffhanger at the very end of the show's second season finale that looks like it may never be resolved by a truncated third season or TV movie.
Peggy's decades-long history with S.H.I.E.L.D. is still ripe to be explored, the character herself quite important within the fabric of the MCU, and if the show could find a way to explore said history in the present day - like someone attempting to undo her legacy as the team works to keep it intact - then it could also tie up Agent Carter's loose ends at the same time, satisfying those of us who were fans of that series while bringing back the always-welcome Hayley Atwell for some more flashback fun.