Unlike his predecessors, the Twelfth Doctor wasn't a hugger or a cryer, meaning that he often wasn't very forthcoming with his feelings. Look at how he lied to Clara about finding Gallifrey again ...

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while Peter Capaldi showed up in ‘The Fires of Pompeii’ as Lucius Caecilius before playing the Twelfth Doctor. In terms of guest stars, we know that EastEnders actor Rose Ayling-Ellis and Slow ...