Doctor Who Series 10: 7 Big Questions We're Asking After 'World Enough And Time'

If only the BBC had hired River Song as a publicist. This twists in this episode would have been far more shocking if that was the case. Whilst John Simm was barely recognisable behind the face and voice of Razor, most of us were watching in anticipation of the reveal of the Master. Razor was wrong – plenty of people could see through his disguise early on, especially those who were looking for musical clues from Murray Gold’s Master theme.

Anyone who knows that that Master has a fondness for ‘dressing for the occasion’ and adopting the odd ridiculous persona will have immediately suspected something fishy about the Fagan-like Razor.

Sometimes the Master has used a moniker without the need for hiding his appearance – Colonel Masters, The Reverend Magister, Harold Saxon to name but a few, but we’ve also seen him go the full fancy dress without any rhyme or reason such as when he posed as a scarecrow to spy on the Doctor (The Mark of the Rani).

The Master’s eccentric Dickensian appearance is a homage to the more extraordinary disguises he has worn over the years such as the Portreeve and Kalid. The fact that on this occasion he claims it was purely for Bill’s benefit, so that she didn’t recognise him as former prime-minister Harold Saxon, might be a clue that the whole thing was a trap to lure the Doctor and Missy or that he was the one to put out the distress call. But don’t put it past the unhinged Time Lord to have disguised himself just for the fun of it.