The penultimate episode of Severance season 2, "The After Hours," had some pretty big reveals and raised a whole lot of huge questions.

Season 2, Episode 8 ended with Cobel speeding back to Kier while catching up with Mark over the phone, so she’s likely the “unexpected ally” who’s hatching a plan with him

If you want to watch the episode for yourself, you can watch it on Paramount Plus, but the short version of the story is Marsha discovers that she is a mannequin brought to life, and is part of a group of mannequins on the ninth-floor of this department store that take turns living among the humans for a month at a time each.