Special Guest Stars Victor Garber voices Michael de Graaf Christine Baranski voices Herself Christian Siriano voices Himself Guest Stars Alex Désert voices Carl Carlson Maggie Roswell voices Helen Lovejoy Tony Rodriguez voices Julio Franco Dawnn Lewis voices Bernice Hibbert Kevin Michael Richardson voices Co-Pilot Tress MacNeille voices Luigi's Mother Pamela Hayden voices Employees Chris Edgerly voices Employees