Guest Stars Donna Kimball voices Aughra Jason Isaacs voices The Emperor Benedict Wong voices The General Keegan-Michael Key voices The Ritual Master Gugu Mbatha-Raw voices Seladon Caitríona Balfe voices Tavra Mark Hamill voices The Scientist Simon Pegg voices The Chamberlain 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 Ralph Ineson voices The Hunter Shazad Latif voices Kylan Hannah John-Kamen voices Naia Mark Strong voices Ordon Alice Dinnean voices The Ornamentalist Louise Gold voices Podling Servant #2 Damian Farrell voices Lore