The Mary-Sue Extrusion is a novel by British writer Dave Stone featuring the fictional archaeologist Bernice Summerfield. The New Adventures were a spin-off from the long-running British science fiction television series Doctor Who.^[1]

The Mary-Sue Extrusion

Author	Dave Stone
Cover artist	Fred Gambino
Series	Doctor Who book: Virgin New Adventures
Release number	18
Subject	Featuring: Bernice Summerfield
Publisher	Virgin Books
Publication date	February 1999
ISBN	0-426-20531-6
Preceded by	Where Angels Fear
Followed by	Dead Romance

The title of the book (a reference to a Mary Sue, an authorial wish-fulfillment character) was thought up by Kate Orman, who had been offered the slot, but declined. The title was given instead to Stone, who based the book on material he had written for an abortive standalone science fiction novel.