Transmitted originally: 27 September 1980 to 18 October 1980.
Jacueline Hill plays the leading Deon, Lexa. Hill played the first Doctor's companion Barbara Wright in seasons one and two.
Both Zolfa-Thura and Tigella are loacted in the Prion System
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This is the only story, apart from Season One's 'Inside the Spaceship' and 'The Five Doctors' where all the credited cast members appear in all the episodes.
OTHER FORMATS:
The Fourth Doctor Novelisations
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