Read my full review on my blog: http://ofdiceandpenblog.blogspot-
With UNIT playing such a major role in the history of the television show, it only makes sense that any game based on Doctor Who should need to address and describe the organization so that it can be used in the game, too. This is where Defending the Earth: The UNIT Sourcebook, a supplement for Doctor Who: Adventures in Time and Space, comes in. The book gives an in-depth look at UNIT and how to use it in Doctor Who roleplaying games that feature UNIT in any way, from games completely about UNIT where there is no Time Lord character and all the PCs are members of, or affiliated with, UNIT to games where UNIT only appears on rare occasions, to everything in between. The book contains material, too, that is applicable beyond just UNIT, such as some of the new traits and gadgets, as well as the expanded firearm rules. Defending the Earth continues the trend of high-quality, well-thought-out books for the Adventures in Time and Space game.
[4 of 5 Stars!]