EarthWorld explained

EarthWorld
Author:Jacqueline Rayner
Series:Doctor Who book:
Eighth Doctor Adventures
Release Number:43
Subject:Featuring:
Eighth Doctor
Fitz and Anji
Release Date:March 2001
Publisher:BBC Books
Pages:253
Isbn:0-563-53827-9
Preceded By:Escape Velocity
Followed By:Vanishing Point

EarthWorld is a BBC Books original novel written by Jacqueline Rayner and based on the long-running British science fiction television series Doctor Who. It features the Eighth Doctor, Fitz and Anji.

EarthWorld was re-released in 2013 for the 50th anniversary of Doctor Who.