The Winter Palace (Rebirth Story)

The Winter Palace  was the first episode of the  third series of Doctor Who Rebirth and like the previous season, serves as the Christmas special albeit not releasing around Christmas. It also introduces another companion for the Tenth Doctor.

While investigating the disappearances of children from human colonies surrounding Saturn, The Doctor discovers that an organization has been using the kids as test subjects for experiments and that something sinister lurks beneath the floors of the Winter Palace.