The Doctor works to free his planet of the Vardan menace. How can he defeat an enemy who can read his very thoughts? And does their invasion conceal a greater menace?
Quest roles:
Milton Johns(Guy Crayford), Max Faulkner(Tribesman (uncredited)), Tom Kelly(Guard), Stan McGowan(Vardan), Chris Tranchell(Andred), Hilary Ryan(Rodan), Ray Callaghan(Ablif), Michael Mundell(Jasko), Eric Danot(Castellan Guard), Derek Deadman(Stor), Gai Waterhouse(Presta)