The Doctor, Romana, Adric and K9 encounter the enslaved time-sensitive Tharils, who lead them to a white void occupied only by the ruins of an old building and a spaceship - a dimension that might be the key to escaping E-Space.

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Main Cast: Tom Baker, Lalla Ward, Matthew Waterhouse, John Leeson, Clifford Rose, Kenneth Cope, David Kincaid, Freddie Earlle, Harry Waters, David Weston

Directors: Paul Joyce, Graeme Harper

Writer: Stephen Gallagher

Editor: Rod Waldron

Cinematographer:

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