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The Zero Room is gone and the Doctor's regeneration is dangerously unstable. To help him, Tegan locates the tranquil world of Castrovalva and the TARDIS heads there.

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25 minutes

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Enter The Whoniverse

Enter The Whoniverse

Every Doctor, every companion, every enemy. Discover the Whoniverse. Only on Βι¶ΉΤΌΕΔ iPlayer.