Guest Stars Donna Kimball voices Aughra Jason Isaacs voices The Emperor Benedict Wong voices The General Caitríona Balfe voices Tavra Mark Hamill voices The Scientist Victor Yerrid voices Hup Kevin Clash voices Gruenak #1 Warrick Brownlow-Pike voices Red-Haired Paladin Lena Headey voices Maudra Fara Ólafur Darri Ólafsson voices The Archer Neil Sterenberg voices Gruenak #2 Bill Hader voices UrGoh the Wanderer Andy Samberg voices The Heretic Damian Farrell voices Lore Dave Goelz voices Baffi Theo James voices Rek'yr Barnaby Dixon voices Puppet Show Gelfing