Doctor Who : The Armageddon Factor - Part 2 (1979)
Directed by Graeme Harper / Michael Hayes
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Synopsis by Hal Erickson
In the second episode of the six-part story "The Armageddon Factor," the Doctor (Tom Baker) and Romana (Mary Tamm) have materialized on the planet Atrios, in search of the sixth and final missing segment of the Key to Time. Unfortunately, Atrios is locked in deadly combat with its twin planet Zeos -- and the Doctor and Romana are caught in the middle of the fray, along with the fiercely proud and determined Princess Astra (Lalla Ward). Originally telecast on January 27, 1979, as the record-breaking 500th episode of Doctor Who, "The Armageddon Factor, Episode 2" was written by Bob Baker and David Martin.