Having decided that everyone could do with a holiday, the Doctor takes Graham, Yasmin, Ryan to a luxury resort for a spot of rest and relaxation. However, they discover the place where they are having a break is hiding a number of deadly secrets. What are the ferocious monsters that are attacking Tranquillity Spa?
Elenco: Matt Smith , David Tennant , Arthur Darvill , Karen Gillan , Jenna Coleman , Peter Capaldi , Jodie Whittaker , Billie Piper , Mandip Gill , Bradley Walsh , Tosin Cole , Christopher Eccleston , Freema Agyeman , Catherine Tate , Pearl Mackie , Matt Lucas , John Bishop .