The Companion's Companion (novel)

was the fourth book in the Official Guide series, published on 6 April 2017 by Penguin Group, written by Craig Donaghy and illustrated by Dan Green. The book was stylised as an in-universe guide written by Clara Oswald for the next companion to travel with the Doctor.
== Publisher's summary ==
If there's one thing the Doctor ought to remember, it's this: he should never travel alone.
And to help make sure he always has someone suitably brilliant by his side, Clara has compiled this comprehensive guide to travelling with the Doctor. Packed full of hints and tips on topics such as introducing the Doctor to your family, packing for life on the TARDIS and practising alien first aid, this guide will fully prepare you for life as a companion!
== Worldbuilding ==
=== Individuals ===
* Clara Oswald was allowed access to the Black Archive. She was given information on all of the Doctor's companions up to her, as well as other material from past companions (see below).
* Donna Noble kept a diary of her adventures. After her memory was erased, Wilfred Mott took it to prevent her from remembering and donated it to UNIT.
* Amy Pond wrote about her travels with the Doctor in a letter on 23 November,1963.
* Susan Foreman wrote a letter as well to her grandfather, thanking him for taking care of her.
* Jamie McCrimmon wrote a letter as his memories were being erased.
* Rose Tyler emailed Mickey Smith on the October 3rd, 2005, about her travels with the Doctor. It's possible that the emails were lost in the Time Vortex and were not delivered on time.
* Grace Holloway wrote her account of the events that happened on the 31st of December, 1999.
* Ace left her own rudimentary guide on travelling with the Doctor.
* Rory Williams, Martha Jones, Tegan Jovanka, and Jo Grant were interviewed by UNIT.
* Peri Brown made several custom postcards featuring the places she travelled with the Doctor.
* Martha Jones wrote a manual on first aid to alien creatures she encountered.
* Clara Oswald personally interviewed K9 Mark IV, the Paternoster Gang, Kate Stewart, and the data ghost of River Song.
* The data ghost of River Song knew of the Thirteenth Doctor, and was surprised to find out that she was a woman.
=== Technology ===
* Clara recommended to the next companion to get their phone upgraded by the Doctor at their earliest opportunity. 
=== Books ===
* The Companion's Companion was hidden away somewhere in the TARDIS where the Doctor wouldn't look. Nevertheless, he found it, and left it where it was.
* Due to the companions' general lack of awareness regarding the Doctor's history and enemies, the book likely remained hidden for most, if not all of their time traveling with the Doctor.
== Notes ==
* The second edition adds a page in which Bill Potts responds to Clara and leaves a message.
== Continuity ==
* Clara notes that the Doctor is scared during encounters with the Daleks (TV: Dalek, etc.)
* Clara has been workshopping some new "care cards". (TV: Under the Lake)
== External links ==
* 
Category:2017 novels
Category:BBC Children's Books novels
Category:Official Guides