With the identity of the timeline-unraveling "thread" revealed, the team's mission to protect him at all costs leads each agent to question their own values. Is preserving the future of the world as they know it worth the destruction they could prevent?

A surprise leap forward in time has stranded Enoch in 1931 and landed the team in yet another unfamiliar decade. Now, in order to stop the Chronicoms from launching their newest future-dismantling plan, the agents will have to infiltrate one of S.H.I.E.L.D.’s most secure bases. They won’t be able to succeed without help from a familiar face or two.

It was just another average morning on July 22, 1955, when Agent Phil Coulson realized the importance of that day in the S.H.I.E.L.D. history books. With a chip on his shoulder and a genre-bending glitch in his system, he’d set into motion a chain of events that would hopefully preserve the timeline as we know it and ensure those pesky Chronicoms get the ending they deserve. What could go wrong?

After a bumpy landing in the disco decade, the team – Daniel Sousa in tow – reunites with more than one familiar face at the S.H.I.E.L.D. hangout and discovers exactly how to dismantle the Chronicoms’ latest plan. But when they get too close for comfort, the Zephyr unexpectedly leaps forward again, this time to a date pivotal to not only the future of S.H.I.E.L.D. but to the future of Director Mack as well.

The stakes are higher than ever when, after blowing their cover and damaging the Zephyr in the process, the team must scramble to rescue Mack’s parents, save S.H.I.E.L.D. from a Chronicom infestation, and fix the ship … all before the next time-jump. Meanwhile, Daisy and Sousa find themselves at a disadvantage against a power hungry Nathaniel Malick and his goons, and Coulson will have to do the thing he does best in order to save the future.