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.
Tom Baker
The Doctor
Lalla Ward
Romana
Matthew Waterhouse
Adric
John Leeson
K9 (voice)
Clifford Rose
Rorvik
Kenneth Cope
Packard
David Kincaid
Lane
Freddie Earlle
Aldo
