Doctor Who - Mawdryn undead : based on the BBC television serial by Peter Grimwade by arrangement with the British Broadcasting Corporation

The Doctor's time-travelling machine is trapped in the flight-path of an alien spacecraft in orbit around the Earth. To avoid the fatal impact of a head-on collision the TARDIS resorts to the only escape possible and materialises on board the on-coming liner. This solves the immediate problem, but a new difficulty arises — the TARDIS cannot get off the ship until a radio signal transmitting from Earth has been disconnected. The Doctor sets off in a Transmat Capsule, having programmed the TARDIS to enable Tegan and Nyssa to follow him once he has dealt with the interference. Naturally enough, things don't go quite as planned... ISBN : 9780426193937 The Doctor and his companions arrive on Tegan's home planet at a moment of crisis: a Concorde aeroplane has inexplicably vanished while in flight. The Doctor, Tegan and Nyssa, together with the TARDIS, join the crew of a second Concorde that sets out to simulate the fateful journey of the missing supersonic jet... Coming back to Earth is not the return to normality that the rescue team might reasonably have expected. Seeing is believing, people say. The Doctor and his friends begin to realise that it just isn't as simple as that...