Judoon troopers have been sent to catch the Invisible Assassin at Elvis the King Spaceport, forcing the Doctor into a strange alliance.
Pg 13 Aboard the Space Freighter Tintin, 2487.
Pgs 27-28 "The reached a particular cafe with a terrace area that allowed diners to look out over the arrivals hall and loomed over a pair of Draconians" Frontier in Space.
Pg 29 "The Doctor nodded and pulled his psychic paper from his jacket pocket" The End of the World et al.
Pg 39 Reference to Kronkburgers (The Iron Legion and The End of the World).
Pg 46 Further reference to Kronkburgers.
Pg 116 "I love old railway stations. Never know what you're going to find in them. Blokes worshipping old books and fighting over water, giant robotic yeti." The Mysterious Planet (thanks to Mark Brown for spotting this one), The Web of Fear.
Pg 128 "It proved impervious to Nikki's lock-picking skills and immune to the Doctor's sonic device. 'Deadlock sealed.'" The sonic screwdriver first appeared in Fury from the Deep. Deadlock seals were first mentioned in Bad Wolf and were said to be impervious to the sonic screwdriver in School Reunion.
Pg 134 "If even clone races like the Sontarans could have distinct personalities, then alien races like the Khellian Horde, the Hath and the Judoon were bound to be more varied." The Sontarans first appeared in The Time Warrior. Khellians appeared in the Decide Your Destiny book, The Time Crocodile. The Hath appeared in The Doctor's Daughter.
Pg 136 "That Agatha Christie, she was brilliant!" The Unicorn and the Wasp.
Pg 158 "The Doctor thought the room was probably the size of a football pitch, about the same size as the swimming pool he'd once had in the TARDIS" The Invasion of Time.
Pg 198 "'Dads and daughters,' muttered the Doctor by way of a reply. 'Difficult relationship. Can be, anyway...'" The Doctor's Daughter.
Pg 239 "There out to be a little shop" New Earth.
OLD FRIENDS AND OLD ENEMIES
The Judoon first appeared in Smith and Jones.
NEW FRIENDS AND NEW ENEMIES
Nikki Jupiter, Judoon Commander Rok Ma, Jase Golightly, Conrad Jupiter, Derek Salter, Dantin, Corilli.