Special Guest Stars Lizzo voices Herself Lizzo voices Goobie Woo Tim Robinson voices Mercer Bowen Yang voices Richard Guest Stars Grey DeLisle Griffin voices Martin Prince Tress MacNeille voices Crazy Cat Lady Kevin Michael Richardson voices Fat Goblin Tress MacNeille voices Train Announcer Tress MacNeille voices Tortured People Pamela Hayden voices Tortured People Chris Edgerly voices Tortured People James Sie voices Pol Pot