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The Haunted House
Author	Trevor Baxendale
Series	Doctor Who novelisations
Publisher	Pearson Education
Publication date	September 2010
ISBN	978-0-435-91473-8

16 – *The Eternity Trap*
16 – The Eternity Trap
The Sarah Jane Adventures story
Cast
	Starring Elisabeth Sladen – Sarah Jane Smith; Daniel Anthony – Clyde Langer; Anjli Mohindra – Rani Chandra;
	Others Floella Benjamin – Professor Rivers; Donald Sumpter – Erasmus Darkening; Callum Blue – Lord Marchwood; Adam Gillen – Toby Silverman; Amelia Clarkson – Elizabeth Marchwood; Rhys Gear – Joseph Marchwood; Tony Boncza – Mr Scriven;
Production
Directed by	Alice Troughton
Written by	Phil Ford
Script editor	Gary Russell
Produced by	Nikki Wilson; Phil Ford (co-producer)
Executive producer(s)	Russell T Davies; Julie Gardner; Piers Wenger
Music by	Sam Watts
Production code	3.7 and 3.8
Series	Series 3
Running time	2 episodes, 25 minutes each
First broadcast	5 November 2009
Last broadcast	6 November 2009
Chronology
← Preceded by; The Wedding of Sarah Jane Smith	Followed by →; Mona Lisa's Revenge
	List of serials

The Eternity Trap is a two-part story of The Sarah Jane Adventures which was first broadcast on CBBC on 5 and 6 November 2009. It is the fourth serial in the third series. The story involves the scientific investigation of a haunted house.

Plot

In the 17th century, Lord Marchwood employed Erasmus Darkening, an alien trapped on Earth, to make gold out of base metals. Erasmus was secretly working on a transdimensional accelerator to create a portal to his own galaxy. While Marchwood's children spied on Erasmus, he used the accelerator to trap them between dimensions. Lord Marchwood confronted Erasmus and attacked the machine, causing it to malfunction. To maintain immortality, Erasmus used the energy from people he had trapped over the centuries with his technology.

In the present, Professor Rivers and her assistant Toby perform a scientific investigation of ghost sightings at Lord Marchwood's manor. They are joined by Sarah Jane, Clyde, and Rani. A mysterious poltergeist-like entity begins manipulating objects, including writing the message "get out" on a mirror; this is Lord Marchwood trying to scare everyone off to avoid a similar fate. Erasmus uses the accelerator to take Professor Rivers, though she is yet to be fully absorbed by the manor.

Lord Marchwood slays a creature that came to the manor during one of Erasmus' unsuccessful experiments. Aided by Lord Marchwood's sword as a conductor, Sarah Jane comes up with a plan to stop Erasmus by turning him into electricity. Erasmus is destroyed and Professor Rivers is returned. Sarah Jane destroys Erasmus' machine with the sonic lipstick. While Erasmus' victims were assumed to have been destroyed as well, Lord Marchwood and his children appear in the window of the manor.

Continuity

Tommy Knight was not available for filming of this episode due to his GCSE exams. This story is therefore the first not to feature Luke Smith. As a result of this absence, Elisabeth Sladen is the only cast member to have appeared in every episode of the series. Other series mainstays such as Mr Smith, K9, Sarah Jane's attic and Rani's parents, Haresh and Gita, do not appear in this story.

Novelisation

Pearson Education published a simplified novelisation of this episode by Trevor Baxendale under the title The Haunted House for school literacy programs in September 2010.^[2]