The pop-up began when a large glass box appeared in Grand Central's Vanderbilt Hall, containing a replica of the four-seated desk from Lumon's Macrodata Refinement department. Hired actors playing Lumon employees sat at their desks, doing Lumon things (by which I mean, sorting numbers while not having a clue what said numbers mean).

Stars Adam Scott, Britt Lower, Zach Cherry, Tramell Tillman and Patricia Arquette all appeared at the New York City station on Tuesday, Jan. 14

Adam Scott, Britt Lower, Zach Cherry, Patricia Arquette and Tramell Tillman all appeared as their 'Severance' characters for the pop-up. Ben Stiller was on hand for pictures.

The cast of Severance gave New York City's commuters a rush hour they'll never forget. On Tuesday, the cast of the hit Apple TV+ series promoted the show's second season with a live viral stunt at New York City's Grand Central Terminal.