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In the eighth episode of the 12-part story "The Dalek Masterplan," the Doctor (William Hartnell) resumes his efforts to foil the mass-destruction schemes of the mutant Daleks. Unfortunately, he stymied by the unexpected appearance of his old enemy, the renegade Time Lord known as the Meddling Monk (Peter Butterworth). On another front, the Daleks, angrier than ever, step up their campaign of devastation. Written by Dennis Spooner, "Volcano" originally aired on January 1, 1966; this episode apparently no longer exists.