The Ice Warriors take control of the planet and force the miners to return to work but Ettis takes the opportunity to try and destroy the citadel.
Quest roles:
Terry Walsh(Doran (uncredited)), Sonny Caldinez(Sskel), Stuart Fell(Roga), Alan Bennion(Azaxyr), Rex Robinson(Gebek), Roy Evans(Miner), Donald Gee(Eckersley), Frank Gatliff(Ortron), Ralph Watson(Ettis), Graeme Eton(Preba), Ysanne Churchman(Spider (voice)), Nina Thomas(Thalira)