Foundation

The explanation is, even for a show so prone to WTF moments, highly convoluted. See, Gaal was able to mind-link with Hari, freeing him and guiding him to safety—while forcing the poor sap who was guarding Hari to take his place. Then, she used some razzle-dazzle to make the guard look exactly like Hari, and exerted a lot of effort to keep Tellem and company from figuring out the truth. Long story short: Tellem’s dead, Hari-with-a-body is alive. Tellem’s white-robed minions emerge from the Ignis forest, grateful to be freed of her oppressive presence—major “Ding-Dong! The Witch Is Dead” vibes in this scene.
Elsewhere, as we saw last week while Terminus was being targeted by Empire’s bitchy sense of justice, Demerzel (Laura Birn) decided she was finished with the increasingly unhinged Brother Day (Lee Pace). Realizing his many cumulative failings had overtaken anything she could do to set him back on track, she high-tailed it back to Trantor to handle more pressing business. That being, of course, that Brother Dusk (Terrence Mann) and Rue (Sandra Yi Sencindiver) had discovered the hidden cell where Demerzel was kept for thousands of years—from the end of the Robot Wars until Cleon I discovered her, hundreds of years prior to Foundation’s present—and were then, themselves, sealed inside by Cleon I’s hologram.