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b"In The Doctor's continuing attempt to get Tegan home, the TARDIS gets pulled off course and lands on a ship populated by different cultures from Earth's past. They are being brought home but why now after so long? \\n\\xa0\\nThis week, Paddy and Tricia follow The Doctor and his friends as they attempt to unravel the mystery of the ship and it's mysterious owners in Four to Doomsday."