Another Marvel era is ending as Agents of S.H.I.E.L.D. gears up for its seventh, and final, 13-episode season on ABC. The spin-off series created by The Avengers writer and director Joss Whedon brought Agent Phil Coulson (Clark Gregg) back from the dead to lead an elite squad of agents to take on the terrorist group Hydra, eventually incorporating a superhuman race called Inhumans into the storyline. The official trailer has now been released, giving us a better look at what's in store for Coulson and his team on their final mission.
(Warning: some major spoilers for S5 and S6 below.)
Many cast and crew members expected Agents of S.H.I.E.L.D. to end after S5, especially since Gregg's beloved Coulson character died (again) in the finale, spending his last days alone on a romantic tropical beach in Tahiti with May (Ming-Na Wen). Instead, ABC renewed it for a shortened sixth season of 13 episodes, adding a surprise renewal for a seventh and final season before S6 had been released.
S6 found our heroes battling the "Shrike," planet-invading parasites that enter human hosts and cause them to explode into crystalline structures. Gregg returned as "Sarge," a hardened, bounty-hunter version of Coulson created on another planet in the past when the three Monoliths (representing space, time, and creation) exploded. He was actually a non-corporeal being who confused his own memories with those of Coulson when he took on the latter's form.
Complicating matters was another non-corporeal being, Izel (Karolina Wydra), who sought to possess the Monoliths' energy for herself. There were also some aliens called Chronicoms seeking Fitz and Simmons' help in solving the problem of time travel so they could save their home planet, Chronyca-2—until there was an internal coup and their focus changed to taking over Earth as their Chronyca-3.
The S.H.I.E.L.D. team ultimately defeated the Shrike invasion, Izel, and Sarge, but at great cost: May was fatally wounded. In desperation, our heroes placed May in a stasis pod, and an upgraded, time-traveling version of their ship, the Zephyr One, zapped them several decades into the past, where they are trapped going into S7. Meanwhile, Simmons built a Life Model Decoy of Coulson, replete with knowledge about the entire history of S.H.I.E.L.D., to help them navigate through history and hopefully save the future once and for all.