Jon Culshaw reads this exciting novelization of a 1975 TV adventure featuring the Fourth Doctor. At a time in the far-off future, Earth has become uninhabitable. A selection of Humanity is placed, deep-frozen, in a fully automated space station, to await the day of their return to Earth. Thousands of years later, the Doctor arrives with his companions Sarah and Harry, and finds things going suspiciously wrong. The station is under attack from the giant Wirrn, deadly creatures who, in their lust for power, now threaten the future of the whole Human Race . . . Jon Culshaw reads this unabridged novelization written by Ian Marter, who played Harry Sullivan in the original BBC TV series.