"The events will happen, just as they are written. I'm afraid so and we can't stem the tide. But at least we can stop being carried away with the flood!"

And there's a veritable flood of unexpected stars in the Season One closer, The Reign of Terror.

Rowan Atkinson captures the younger three-quarters of the TARDIS team, while Jonny Vegas bangs them up. Bill Murray busts them out only for Ian to nearly come a cropper at the hands of Rentaghost's Mr Meaker, who himself has another bust in mind when it comes to Babs.

And an extra gets his moment in the sun too – quite literally – as William Hartnell's Lime Grove-inspired agoraphobia prevents him from indulging in a spot of location filming.

The first Doctor's old body may already be wearing thin after walking all the way to Paris but he looks as robust as Charles Atlas next to his galactically feeble granddaughter Susan, who does more to imperil the time travellers than either First Deputy Robespierre or the last-past-the-post Traitor Party.

But even in 1794 or 1964, nothing is black and white, so who’s right and who’s wrong? Robespierre or Renan? Barbara or Ian? Jim or Martin?

Listen and decide…