Doctor Who: The Face in the Storm Part 1 (13.6A)

1916 and the TARDIS has landed in the cargo hold of the SS Maycrest, a ship transporting soldiers across the Atlantic.

Except that's not all that's being transported across the ocean. Because the Doctor and his friends find a strange crate in the hold, a crate that's unnaturally cold.

But the contents of the crate are not the ship's biggest secret. Nor it's deadliest threat...