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