Any science-fiction show that runs long enough will inevitably have its "parallel Earth" episode. Doctor Who hit that milestone in 1970 with Inferno, an action thriller that sees the Doctor "slip sideways in time" to an Earth with a taste for fascism and clean-shaven blokes. The series' last seven-part story is fondly remembered, but does it still hold up? And more important: Is it better than Pyramids of Mars? Ignoring all safety protocols, Chris and Pete accelerate the drilling into this episode to find out.

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Outro music: Chronos by Alexander Nakarada