Marvel's Agents of S.H.I.E.L.D. S05E10 "Past Life" Recap

Kasius mourns the loss of Sinatra on the Zephyr, while the team onboard are formulating a plan to get to Flint and rescue all the imprisoned Inhumans. Kasius infects Tye, the trainer of Inhumans, with an ominous substance that triggers maniacal behaviour. Kasius then orders him to go after the team to stop them from going through with their plans to return to the past. Daisy fights him off and is seemingly able to stop him, but later Coulson is shown to be infected from the same substance.

Kasius' seer is finally revealed, and it's a version of Yo-Yo from the future that has lived through the time loop and consequently suffered tremendous torture. The current Yo-Yo meets her and is shocked by the revelation. Future Yo-Yo says that the team returning to the past will be the very thing that brings about the destruction of their world and the only way to stop it is to allow Coulson to succumb to his infection.

Flint follows Simmons' instruction in order to recreate the monolith while Mack heads out to find Yo-Yo. Ultimately, Mack witnesses Kasius kill the future Yo-Yo, after which Kasius consumes the remaining odium and attacks Mack. A fight ensues and eventually Simmons is able to intervene and help Mack kills Kasius. Mack is overjoyed to reunite with the present Yo-Yo, who is still alive.

Deke returns to the Zephyr just in time to save Enoch and fix the machine, though it appears as though both have been sacrificed as the price for the team being able to return to the present.

Marvel's Agents of S.H.I.E.L.D. airs on Fridays on ABC at 9/8c.