The Doctor's TARDIS is stolen, and tracking it down reveals the existence of an alien named Kalid controlling events in the past. While the Doctor challenges Kalid's motives for being there, Tegan and Nyssa discover the source of Kalid's power - an even greater threat for the Doctor. Written by
Did You Know?
A double stood in for Anthony Ainley
during Kalid's transformation at the end of this episode so Ainley could prepare for the rest of the scene. The double nearly choked to death when his mouth and nose began to fill with the green fluid. See more
My familiar spirits have told me of your, uh, miraculous cabinet. The spirits have told me you would come.
The spirits are very well-informed.