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19. The Valeyard

A distillation of the Doctor's dark side given physical form, the Valeyard (Michael Jayston) appeared in three stories as part of the epic 'Trial of a Time Lord' season in 1986. He's presumably still out there, but we really can't imagine Chibnall picking up a thread from a Colin Baker story three decades old.

Which classic Doctor Who monsters are most likely to return next?

The Daleks have resurfaced. But who will follow?

From Digital Spy