Guest Stars Anders Holm as JJ Jack McBrayer as Luther McMonster Riki Lindhome as Justine the Belieber Nicole Byer as Beatrice of the Beyhive Joe Lo Truglio as Clark the Mo-Cap Maestro Rachel Bloom as Samantha Swiftie Co Starring Alice Dinnean as Supporting Muppet Performer Bradley Freeman Jr. as Supporting Muppet Performer Donna Kimball as Supporting Muppet Performer Sarah Oh as Supporting Muppet Performer David Bizzaro as Supporting Muppet Performer Stephanie D'Abruzzo as Supporting Muppet Performer Jon Bailey voices Voice of God