The Doctor and his friends discover a rival group of time travellers prowling around in the English countryside in the 1930s... and a disturbingly high number of aggressive wasps.
Fitz and Anji.
The village of Marpling.
Pg 10 "On the contrary, he acted more like a man who had been given the chance to start afresh, unencumbered, reborn." Recap of the Earth arc.
Pg 21 "His own memories seemed a little cloudy these days." Fitz's memories have been gradually disappearing since Escape Velocity.
Pg 25 "Sometime ago I stayed at Longleat with the Marquis of Bath." Longleat was the site of the twentieth anniversary exhibition. The Marquis of Bath was a Doctor Who fan.
Pg 40 "I've always preferred butterflies myself." Vampire Science introduced the Butterfly room in the TARDIS.
Pg 75-76 "An old handwritten letter on real paper from someone signing herself 'Mary Minnett'. It was dated 22 August 1918 and addressed to her doctor." Mary Minnett was in Casualties of War and was attracted to the Doctor and wrote him letters.
Pg 84 "'I'll explain later,' said Fitz smugly." Curse of the Fatal Death.
Pg 92 "Blimey, he thought, I'm a citizen of the universe now." Reference to The Dalek Masterplan, where the Doctor describes himself as a citizen of the Universe and a gentleman to boot.
Pg 162 "On the sort of timescale we're talking about, it's no more than that. She clicked her fingers sharply." This echoes the end of Genesis of the Daleks.
Pg 237 "You're too late, Doctor..." This might be a reference to Curse of Fenric, given that Millington says exactly the same thing, or it might not.
Pg 246 "If that nuke goes off Doc, there won't be much point in stepping outside and crouching down behind a car, will there?" Nevertheless, this is exactly what the fourth Doctor and company did in The Hand of Fear.
OLD FRIENDS AND OLD ENEMIES
NEW FRIENDS AND NEW ENEMIES
A commando team from the future.