Plot summary
Inhuman S.H.I.E.L.D. asset Elena Rodriguez is caught in a blackout in Miami. Reyes and Daisy are caught in another in Los Angeles. A group claiming to be the Inhuman resistance, fighting registration after the Sokovia Accords, takes responsibility. Reyes explains that his uncle, Eli Morrow, was imprisoned for causing an explosion at Momentum that apparently created the ghosts; he believes that atoning for Morrow's sins will pay his debt to the Devil and rid Reyes of the Ghost Rider. At the Reyes' house, Gabe realizes that Daisy is Quake and asks her to leave Robbie alone.
Radcliffe and Simmons "cure" May by killing and reviving her. Coulson, Mack, and Fitz save Rodriguez from a group of Watchdogs and find the EMP that caused the blackout—it was set off by the Watchdogs, who had access to S.H.I.E.L.D.'s list of registered Inhumans and have backing from Senator Ellen Nadeer, whose brother Vijay Nadeer is encased in an Inhuman terrigen cocoon. Hoping to assuage public fears of the Inhumans, Mace announces the return of S.H.I.E.L.D.
Credits
Adapted from Wikipedia contributors, Agents of S.H.I.E.L.D. season 4. HTML formatting and reference markers removed.