Summary:
In the conclusion of the six-part story "The Invasion of Time," the Sontarans launch their invasion of the Time Lords' home world of Gallifrey. As Lord President, the Doctor (Tom Baker) tackles the responsibility of fending off the Sontarans. But first, he must assemble the forbidden de-mat gun, controlled by the Great Key of Rassilon -- and this act has a very profound effect o... Full Summary >>

Cast:
Tom Baker - (The Doctor)
Louise Jameson - (Leela)
John Leeson - (K-9)
Milton Johns - (Castellan Kelner)
Christopher Tranchell - (Cmdr. Andred)
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