Guest Stars Olivia Ross as Mademoiselle Bourienne Matthew Stagg as Nikolushka (Age 5-6) Emily Taaffe as Katya Thomas Arnold as Vassily Denisov Rory Keenan as Bilibin Chloe Pirrie as Julie Karagina Ben Lloyd-Hughes as Tsar Alexander David Sibley as Bakshin Milo Twomey as Grigori Dan Tetsell as Postmaster Vidmantas Fijalkauskas as Pyotr Matthew Raymond as Nevitsky