Guest Stars Donna Kimball voices Aughra Mark Hamill voices The Scientist Jason Isaacs voices The Emperor Benedict Wong voices The General Keegan-Michael Key voices The Ritual Master Caitríona Balfe voices Tavra Simon Pegg voices The Chamberlain Gugu Mbatha-Raw voices Seladon Victor Yerrid voices Hup Harris Dickinson voices Gurjin Neil Sterenberg voices The Scroll Keeper Awkwafina voices The Collector Kevin Clash voices Gruenak #1 Harvey Fierstein voices The Gourmand Warrick Brownlow-Pike voices Podling Servant #1 Ólafur Darri Ólafsson voices The Archer Neil Sterenberg voices Gruenak #2 Shazad Latif voices Kylan Hannah John-Kamen voices Naia Mark Strong voices Ordon Ralph Ineson voices The Hunter Alice Dinnean voices The Ornamentalist Louise Gold voices Podling Servant #2 Damian Farrell voices Lore