Will Swenson and Mark Jacoby star as Diamond in the jukebox biomusical's pre-Broadway run in Boston.
The cast made an appearance on The Late Late Show with James Corden.
The Aldous Huxley novel is receiving an adaptation with a book by Ben Andron, music by John McDaniel and Jonnie Rockwell, and lyrics by Bill Russell.
The Glee performer shares how his previous roles prepared him to take over the judge's seat.
Miranda Haymon directs the Roundabout Underground production about six students stuck in detention.
Amara Okereke, Harry Haddon-Paton, and Vanessa Redgrave lead the Bartlett Sher-directed revival.
The process will culminate with a group of stage and screen artists creating four original musicals.
Joe Barros will direct the musical penned by Aaron Morrill.
See rehearsal photos from the production, featuring a cast of female, Non-binary, and Trans performers.