If there’s been one thing wrong with series ten of Doctor Who so far it’s that there’s been a distinct lack of Nardole . Matt Lucas’ character from The Husbands of River Song becoming a series regular came as a surprise, but since then the mystery surrounding him has only heightened as we discovered he was tasked with keeping the Doctor grounded on Earth. Thankfully this time he’s joining the Doctor and Bill on their latest adventure, in the series’ fifth episode – Oxygen . This episode was written by new fan-favourite Jamie Mathieson , who previously penned Mummy on the Orient Express and the excellent Flatline as well as co-writing The Girl Who Died with Steven Moffat.