It's a dastardly double bill on this week's I'll Explain Later as we look back on the Doctor's encounters with two diabolical masterminds - Professor Zaroff, in aquatic Second Doctor caper The Underwater Menace, and The Sixth Master (as no-one calls him) in apocalyptic Tenth Doctor series finale The Sound of Drums / Last of the Time Lords. Can anything in the world stop us now? With our erratic release schedule, probably, but do check back next week for our next exciting episode...

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