WARNING! This article contains SPOILERS for Severance season 2, episode 1!Action star Keanu Reeves makes a surprise cameo in Severance season 2, episode 1, “Hello, Ms. Cobel,” which increases the mysteries surrounding the world of Lumon Industries. Compared to some other sci-fi shows on TV, Severance’s cast and characters stand out for how limited its world expansion has been with new faces. For the most part, the show is confined to the employees in Macrodata Refinement, their supervisors, and Mark’s close family and friends outside Lumon’s office, which doesn’t easily lend itself to the potential for big-name cameos.

https://screenrant.com/severance-season-2-keanu-reeves-voice-cameo-explained/