when did nardole first appear in doctor who
Nardole Nardole is a fictional character created by Steven Moffat and portrayed by Matt Lucas in the long-running British science fiction television series Doctor Who. He is a companion of the Twelfth Doctor, an incarnation of the alien time traveller known as The Doctor, portrayed by Peter Capaldi. He initially appeared in the 2015 Christmas special "The Husbands of River Song" as a companion of River Song, before returning in the following episode "The Return of Doctor Mysterio", having become the Doctor's companion in the meantime.