Guest Stars Jeffrey Thomas as Jason Tamara Gorski as Morrigan Gina Torres as Nebula Michael Hurst as Dahak George Henare as Zarathustra Claire Stansfield voices Mnemosyne Donogh Rees as Mnemosyne Stephanie Liebert as Antibius Danny Lineham as School Teacher Joseph Greer as Nikos Graeme Moran as Professor Matthew Van Den Berg as Warrior Murray Dahm as Guard Robyn Duncan-Cox as Olivia Monique Joel as Woman Demon Convert