The Return of the First Avenger
Ultimately, the season featured several tie-in episodes with Marvel Cinematic Universe films: the episode "The Well" takes place directly after the events of ""; the episode "T.A.H.I.T.I." introduces the alien race the Kree to the MCU (confirmed as such in the second season), members of which play a significant role in "Guardians of the Galaxy"; and the episodes "End of the Beginning" and "Turn, Turn, Turn" revolve around the events of "Captain America: The Winter Soldier". Due to "Captain America: The Winter Soldier" revealing that Hydra had infiltrated S.H.I.E.L.D. with sleeper agents, the season sees a retooling for the final six episodes. Regarding the synergy the show has with addressing events from the films, Loeb said "It's an extremely unique experience that doesn't exist anywhere else out there in the entertainment business". The characters simultaneously face Hydra and a power struggle within S.H.I.E.L.D., and trust issues with each other. Jed Whedon added that that Hydra sleeper agents, which the show could not address until after the release of "The Winter Soldier", was an attempt to address the lack of characters from the comics, a complaint fans had throughout the season.