Summary:
In the conclusion of the six-part story "The Armageddon Factor," the Doctor (Tom Baker) has discovered that Princess Astra (Lalla Ward) of the planet Atrios is, in fact, the much sought-after sixth element of the Key to Time. Armed with this knowledge, the Doctor and Romana (Mary Tamm) are at last able to reassemble the Key, thereby restoring the balance between u... Full Summary >>

Cast:
Tom Baker - (The Doctor)
Mary Tamm - (Romana)
John Leeson - (K-9)
Lalla Ward - (Princess Astra)
John Woodvine - (Marshal of Atrios)
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