We're back for another season of Silo, but this time we're spending just as much time outside as we are in.Season 3 picks up where Season 2 left off, making it clear that the shocking flashback in last season's finale wasn't just a one-off. Alongside Juliette (Rebecca Ferguson) grappling with memory loss in the present day, the episode also follows congressman Daniel Keene (Ashley Zukerman) and journalist Helen Drew (Jessica Henwick) in the pre-silo days, with Keene's naval pilot sister Charles (Jessica Brown Findlay) heading off on a combat mission that almost gets her killed.But what's with the mysterious cloud she encounters, and how might it connect with the silo? Let's dive in.

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What happens in Silo Season 3, episode 1?After a peculiar meeting in which she warns her brother to get on the Iran committee run by Senator Thurman (Laura Innes), we see Charles cutting through the clear night sky on a mission with her fellow naval pilots.All seems to be going well until a weird cloud appears up ahead. It looks almost like a storm cloud, only with long dark tendrils creeping out of it. "What the fuck's a cloud doing at fifty thousand feet?" asks Charles as she and her fellow pilots fly into it. Inside the cloud a weird, gooey substance shows up on Charles' instrument panel. She touches it, and the residue is reminiscent of the tendrils we saw protruding from the cloud. Shortly after that, planes start to go down around her.