When three of the Doctor's incarnations arrive in Canada at different locations, they uncover a plot by an ancient enemy which could lead to the obliteration of Earth.
When three of the Doctor's incarnations arrive in Canada at different locations, they uncover a plot by an ancient enemy which could lead to the obliteration of Earth.
When aliens come to earth and choose a couple people to put through trials. Mark and Christine must pass the trials, or it will mean the destruction of them and their world.