Peter Capaldi The Doctor Actor Pearl Mackie Bill Actor Matt Lucas Nardole Actor Jennifer Hennessy Moira Actor Michelle Gomez Missy Actor Stephanie Hyam Heather Actor Corrado Invernizzi Cardinal Angelo Actor Joseph Long The Pope Actor Ronke Adekoluejo Penny Actor Ivanno Jeremiah Rafando Actor Francesco Martino Piero Actor Laurent Maurel Nicholas Actor Jamie Hill Fuller Monk Actor Steven Moffat Executive Producer, Writer Daniel Nettheim Director Richard Curtis Writer Chris Chibnall Writer Brian Minchin Executive Producer Toby Whithouse Writer Mark Gatiss Writer Simon Nye Writer