Plot summary
The Zephyr gets trapped in a time vortex as Daisy wakes up from her cryo-chamber. After witnessing several events happen, time suddenly restarts and she realizes that she is trapped in a time loop as the Zephyr gets closer to the center of the vortex with every passing loop. She learns that Coulson is also aware and has been in the loop longer, though Daisy forgets everything when she dies. Daisy and Coulson learn about Simmons' memory implant, but when they try to remove it, a freak accident kills her.
The deaths appear to be orchestrated and Coulson concludes that Enoch, who was programmed to protect Simmons' implant, has been unwillingly killing them. After several failed attempts, they eventually manage to remove the implant and Simmons informs them that Enoch's power mechanism can fix the time drive, though at the cost of his life. In the final loop, Enoch willingly gives up his mechanism and dies, but not before revealing to Daisy that this will be their final mission as a team. Meanwhile, Nathaniel helps Kora control her powers.
Credits
Adapted from Wikipedia contributors, Agents of S.H.I.E.L.D. season 7. HTML formatting and reference markers removed.