Front and centre, soldier! You're part of UNIT now, the Unified Intelligence Taskforce. We are the Earth's best defence against the myriad alien forces who would try to subjugate and conquer our planet.

It's not an easy job, and even those recruited for their scientific knowledge can find themselves on the front lines of combat against almost unstoppable foes. We will protect humanity from extraterrestrial terrors or die trying.

Defending the Earth is a 160 page full colour sourcebook for the Doctor Who: Adventures in Time and Space roleplaying game.