The Ood have given a warning to The Doctor. The Master is returning yet that is not the biggest threat. A darkness is coming which brings with it The End of Time.
Forewarned and with a sense of foreboding, The Doctor races to return to Earth fearing that The Master will somehow return. He has good reason to worry since The Masters minions have in fact found a way to reconstitute him. Re-united with Wilfred Mott, The Doctor desperately tries to locate The Master only to find that he is being held by Joshua and Abigail Naismith who are using alien technology to create a new future for Earth. It's too late however, for The Master has now turned everyone on Earth into his own image. Little does he realize the greater danger that awaits them all. — garykmcd Something vast is stirring in the dark and with the dark prophecy of the Doctor's song finally ending he arrives on Earth to face an old nemesis. But another threat looms on the horizon. Multi-millionaire tycoon Joshua Naismith and his daughter Abigail who also have their eyes set on the Time Lords deranged enemy. The Immortality Gate awaits the Doctor and an even greater foe from his past awaits to make their presence known. Will it be he who will knock four times? With the help of his old friend Wilfred Mott, grandfather to former companion Donna Noble perhaps he will find out who! — Robert McElwaine