New Doctor Who companion Bill (Pearl Mackie) is still getting to know the strange old alien she’s started travelling with – and it looks like she’s about to see his darker side.

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In a new next time trailer for next week’s 1814-set episode Thin Ice, we see the pair enjoying the thrills of London’s last Frost Fair on the frozen Thames (“Regency England – bit more black than they show in the movies” Bill quips), only for things to go awry as a monster lurks under the ice.

But despite the danger down below, the presence of a sinister villain (played by Nathan Barley himself, Nicholas Burns) and a cockney urchin making off with the Doctor’s sonic screwdriver (see below), it seems Bill’s more concerned with her erstwhile tutor’s mysterious past.

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“Have you ever killed anyone?” she asks the Doctor point blank – and while fans will be sure to argue the nuances of whether offing a few Daleks and baddies REALLY counts as murder, we’re betting Bill won’t take the truth too well…

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Doctor Who continues on BBC1 next Saturday at 7.20pm

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