Maureen O’Brien narrates the BBC TV soundtrack of this two-part adventure starring William Hartnell as the Doctor.

“There's always Koquillion. He could keep me here forever...”

Landing on the planet Dido in the 25th Century, the Doctor, Ian (William Russell) and Barbara (Jacqueline Hill) discover a crashed spaceship. Living inside are two survivors from Earth, Vicki and Bennett. Their time awaiting rescue has been blighted by the threats of Koquillion, whose alarming appearance terrifies Vicki.

With Ian and the Doctor ensnared in a deadly trap, Barbara seeks to defend Vicki against Koquillion. But there is more to the situation than meets the eye, and the travellers must risk their lives to discover the truth.

Maureen O’Brien, making her debut as the Doctor’s new companion Vicki, provides newly recorded linking narration, and in a bonus interview she looks back at her time in Doctor Who and subsequent career.

Audio edition produced by David Darlington.
Project Editor: Michael Stevens.

© 2026 BBC Studios Distribution Ltd. (P) 2026 BBC Studios Distribution Ltd.