There's a new traveller on the TARDIS but not everyone is happy to have him on board. Little does the crew know that their feelings of ill ease will soon be pushed aside due to a much deadlier problem.
This week, Paddy and Tricia follow the TARDIS crew as they are separated after being forced to make an emergency landing on an seemingly empty spacecraft in order to save themselves. Will they be able to find each other and find out what is going on the ship before it reaches its Terminus?