Tegan falls once more under the influence of the Mara and directs the TARDIS to the planet Manussa. There, the Federator's son Lon and his mother Tanha are preparing for a ceremony to celebrate the banishment of the Mara five hundred years earlier. The Mara takes control of Lon and uses him and Tegan to obtain from Ambril, the Director of Historical Research, the 'Great Crystal' - the large blue stone that originally brought it into being by focusing energy from the minds of the planet's one-time inhabitants. The Mara now plans to use the crystal during the ceremony to bring about its return to corporeal existence.
Cast
Crew
Fiona Cumming
Director
Christopher Bailey
Writer
Eric Saward
Script Editor
Rod Waldron
Editor
John Nathan-Turner
Producer
June Collins
Production Assistant
Jan Spoczynski
Production Design
Marion Richards
Makeup Artist
Ron Blight
Sound
Henry Barber
Lighting Director
Peter Howell
Original Music Composer, Theme Song Performance
Dick Mills
Special Sound Effects
Margot Hayhoe
Production Manager
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