The Doctor, Yaz and Dan come face to fin with some of the Doctor’s oldest adversaries, the Sea Devils. What terrifying forces lurk beneath the oceans of the 19th century?

Alicia takes refuge in the home of a mysterious stranger. With her fevers growing worse and Arno pursuing her at every turn, Alicia is forced to confront the failings of her past and how she will face her future.

NCIS investigates the kidnapping of Master Sergeant Boomer, a military working dog. Also, Sam looks to sell his boat so he can take care of his father who is suffering from Alzheimer’s.