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b'A power beyond imagining is assaulting the universe and the Time Lords are hard pressed to stop it. With little time to act before the complete destruction of all life in existence, they are forced to break their most sacred law. \\nThis week Paddy and Tricia watch as a monumental event unfolds whereby The Doctor is reunited with his former selves to save day. Can this deadly foe stand against the combined efforts of The Three Doctors?'