Monarch's hospitality even extends to a generaous offer to liberate the time-travellers from the shortcomings of their bodies and replicate them as androids - so much more practical.

Although Adric finds this proposal extremely attractive, the Doctor has good reason to be suspicious of the Monarch's motives ...
 

On its way to Earth the TARDIS unexpectedly metarialises on an alien spaceship. The occupants invite the Doctor and his companions to accompany them to Earth; but their hospitality is not all it seems ...

On board are peoplefrom all eras of Earth's history and the aim of the Urbankans and their reptilian leader, Monarch, is to colonise Earth. Three billion minds are aboard the ship, three billion memories awaiting new, android bodies that will enable them to escape their own dead planet and live forever ...

Doctor Who - Four to Doomsday, featuring Peter Davison as the Doctor, was written by Terrance Dudley; this adaptation is by Terrance Dicks, who for five years was script editor of the series and who has written more than sixty novelisations of Doctor Who television stories.

Doctor Who is currently being reshown on BSB television.