Guest Stars Gerard Monaco as Collins John Dagleish as Felix Adrian Edmondson as Denys Porlock Eve Ridley as Follower Reece Shearsmith as Alan Turing Conleth Hill as Pope Gregory XIII Mark Gatiss as Isaac Newton Jordan Alexandra as Siobhan Adrian Greensmith as Galileo Shaheen Khan as Priya Varma 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