The Slitheen Excursion is a BBC Books original novel written by Simon Guerrier and based on the long-running British science fiction television series Doctor Who.^[1] It features the Tenth Doctor initially without a companion, most likely following on from the fourth series finale Journey's End. During the story he does acquire a temporary companion in the form of university student June who—while still with him at the end of the story—does not appear in any other adventure. It was released on 2 April 2009, alongside Judgement of the Judoon and Prisoner of the Daleks.

The Slitheen Excursion

Author	Simon Guerrier
Series	Doctor Who book: New Series Adventures
Release number	32
Subject	Featuring: Tenth Doctor
Set in	Period between "Journey's End" and "The End of Time"
Publisher	BBC Books
Publication date	2 April 2009
Media type	Hardcover
Pages	256
ISBN	978-184607640-4
Preceded by	Judgement of the Judoon
Followed by	Prisoner of the Daleks