Series: 10
Original Air date: April 29, 2017
Number Doctor: 12th
Companion(s): Bill Potts and Nardole
Writer(s): Sarah Dollard
Director(s): Bill Anderson
Guest Stars:
Nicholas Burns as Sutcliffe
Asiatu Koroma as Kitty
Peter Singh as Pie-Man
Simon Ludders as Overseer
Tomi May as Dowell
Austin Taylor as Spider
Ellie Shenker as Dot
Kishaina Thiruselvan as Harriet
Badger Skelton as Perry
Synopsis: London, 1814. On the frozen Thames, the city celebrates the biggest Frost Fair in decades, but revelers are disappearing beneath the ice, snatched into the depths by a terrifying monster. Can the Doctor and Bill stop it before they are dragged into the icy water?