Time flies when you're having fun, but flying through time can present a whole host of problems. Whether accidentally creating paradoxes, upsetting the course of history or trying to Put Things Right, you're going to need to know your way around the Vortex. You need a guide... a companion. This supplement for Doctor Who: Adventures in Time and Space gives more information on Time Lords, temporal mechanics and time machines. It also takes an in-depth look at earth's important role in time and space, covering prehistory to the 51st Century - a vital aid for running historical campaigns at any time in earth's colourful history.