Melinda May reveals that she knew the truth about Coulson's resurrection and was monitoring him on Nick Fury's orders, and he refuses to trust her any more.

Skye deciphers the coded message, learning that it is intended to instigate an uprising within S.H.I.E.L.D., instructing Hydra sleeper agents to come out of hiding.

Meanwhile, Jemma Simmons and Antoine Triplett learn of the uprising from Anne Weaver upon trying to contact her for help after finding the GH325 in Skye's blood.

and the world, Hand leaves Coulson in command of the Hub while she and Ward escort Garrett to the Fridge, hoping to secure the facility before Hydra captures it.

And from here on, its just full on action and urgency and momentum, and sometimes it takes awhile to set everything up, but we think we're going to bring all those dominoes together really nicely for here through [episode] 22.

"[3] Whedon explained that from the start, the writers knew the Hydra twist would need to have "a personal price to it" either with a death or a turn.

[4]: 162 Brett Dalton first learned of his character Grant Ward's allegiance to Hydra during the shooting of "Yes Men", when the executive producers and writers told him of the twist, on which he said, "I just sat there with my jaw open for the next 20 minutes, and they just did all of the talking because I couldn't say anything.

"[5] In March 2014, Marvel revealed that main cast members Clark Gregg, Ming-Na Wen, Brett Dalton, Chloe Bennet, Iain De Caestecker, and Elizabeth Henstridge would star as Phil Coulson, Melinda May, Grant Ward, Skye, Leo Fitz, and Jemma Simmons, respectively.

From the moment Garrett admits he is loyal to Hydra I had to make sense of these themes and redefine the musical rules moving forward."

Garrett's theme continues to represent that character in scenes just about him, with McCreary finding "Paxton's performance after being revealed as the Clairvoyant [to be] even more fun and energetic.

"[9] McCreary also introduced a new melody, "a simple piece for guitar and rhythm section", in the scene where Garrett and the other members of Hydra are taken away while the series' main and recurring characters react to the revelation of their betrayal.

We just wanted to emphasize the pure shock, and leave the audience feeling dazed at this final unexpected turn.

following the revelation that the terrorist group Hydra has infiltrated the former, the episode and those following it are significantly affected by it, showing the series' characters dealing with this turn of events themselves.

Executive producer Jeph Loeb noted that "It's an extremely unique experience that doesn't exist anywhere else out there in the entertainment business.

", all episodes leading up to the release of Captain America: The Winter Soldier and the series' crossover with that film were marketed as Agents of S.H.I.E.L.D.

Bell stated that the initiative was a way to tie the series back to its comics roots, and was thought of at the beginning of the season.

The production team tried to pair specific artists to the teaser posters based on their previous work and how it connected to the themes and emotion of the intended episode.

Bonus features include behind-the-scenes featurettes, audio commentary, deleted scenes, and a blooper reel.