Peter Grimwade
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 â€” 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...
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Doctor Who: Mawdryn Undead