|Four to Doomsday|
The novelistation of 'Four to Doomsday' was written by Terrance Dicks.
Back Cover Blurb
When the TARDIS happens to materialise on an alien space craft the commander of the ship, the retilian Monarch, invites the Doctor and his companions to continue their journey to Earth in his company.
Monarch's hospitality even extends to a generous 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 Monarch's motives...