Guest Stars Gerard Monaco as Collins John Dagleish as Felix Adrian Edmondson as Denys Porlock Eve Ridley as Follower Reece Shearsmith as Alan Turing Mark Gatiss as Isaac Newton Conleth Hill as Pope Gregory XIII Jordan Alexandra as Siobhan Shaheen Khan as Priya Varma Adrian Greensmith as Galileo Ranika Kaur as Geeta Varma Aarushi Ganju as Nisha Varma Yeit-Ming Fu as Guard Ulrich Brandhoff as Gisler Jenson Cheng as Kublai Khan Phil Wang as Aristotle Nitin Ganatra as Ranjit Varma