The Severance season 1 finale, "The We We Are," follows the innies using the Overtime Contingency to wake up in the outside world, culminating in high-stakes revelations, including Mark learning his wife is alive, Helly exposing her identity, and Irving finding Burt. This climactic episode sees the characters' efforts abruptly stopped by Milchick, leading to a shocking, immediate reversion of their consciousness to their outies.
You can find the episode's plot, analysis, and script details on Wikipedia and the Severance Wiki . Severance subtitles English S01E09