A group of colonists are trying to survive the increasingly harsh winter on a terraformed world. But the Ice Warriors are already present.
Amy and Rory.
Pgs 19/22 In the woodland, outside the city of Beside, on the planet Hereafter, the far future.
A familiarity with the Ice Warriors is slightly helpful, especially The Seeds of Death.
Pg 21 "'I had a fur coat somewhere,' he reflected." The second Doctor, most notably in The Abominable Snowmen and The Five Doctors.
Pg 30 "People didn't wait for you where they said they'd wait (which was rubbush of them,in his opinion, because he'd once waited in more or less the same place for a couple of thousand years)." The Big Bang.
Pgs 39-40 "He produced the travel pass wallet that contained his psychic paper, and showed it to Jack Duggat." The End of the World et al.
Pg 41 "He flipped out his sonic screwdriver." Fury From the Deep et al.
Pg 46 "He'd never seen anything as simple as walkinglook scary before, and that was saying something, because he'd seen Cybermen march." You all know who the Cybermen are. But see Continuity Cock-Ups.
Pg 82 "I'm just going outside now, I may be some time" Said by the Doctor in Revenge of the Cybermen.
Pg 97 "Many years away, in a sideways direction that led to another part of his curiously structured life, the Doctor had visited Scotland and made a good friend there, a highlander called Jamie McCrimmon." The Highlanders.
"The thought of snow, and Jamie, took the Doctor back to his original, uneasy hunch." The Ice Warriors (the story).
Pg 119 "Houdini built a career out of this" Planet of the Spiders.
Pg 120 "I mean, as I remember it, it was a friend of mine called Victoria that first called them Ice Warriors." In the story of the same name.
"'How many times have you been on the right side of them?' asked Amy. 'Oh, a couple of times at least.'" The Curse of Peladon most notably.
Pg 158 "I've seen them doing their own terraforming. I even saw them try it on Earth one." The Seeds of Death.
Pg 184 "It didn't matter how big, or difficult, or scary, or intractable, or galaxy-crushing, or tal-king-like-this-in-a-ras-ping-mon-otone-ro-bot-voice-and-u-sing-words-like-ex-ter-minate a problem was, the Doctor relished them." Reference to the Daleks. But see Continuity Cock-ups.
Pg 188 "They were carrying swords. Dirty great,double-handed, barb-hilted broadswords." Similar to the one of the cover of Legacy.
Pg 208 "It's not even like it's a difficult name to remember, like Jagrafess or Castrovalva" The Long Game, Castrovalva.
"I mean, a friend of mine just made it up on the spot." The Ice Warriors (the story).
Pg 261 "Were you planning to use seed technology to bring about climate alterations?" The Seeds of Death.
Pg 264 "You employed seed technology first?" The Seeds of Death.
Pg 265 "Seed technology was no longer viable, because the vermin simply devoured it." The Seeds of Death.
OLD FRIENDS AND OLD ENEMIES
The Ice Warriors (though none that we've met before).
NEW FRIENDS AND NEW ENEMIES
Annabel, Vesta, Samewell, Bill Groan, Winnower, Jack, Lord Ixyldir, Ssord.
Pgs 138/153 Transrats, mutated rats with extra legs, no eyes or hair and the size of terriers.
Pgs 267/269-270 Transhumans, bio-engineered humans with cybernetic talons, armoured cables, sockets and surgical plugs around the skin that moves on all fours like a big cat, with large steel-coated teeth.