The Valeyard
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I think that was an attempt by the writers/BBC to course correct after Capaldi's first season was poorly received by the general audience because he was "too mean."His doctor just struck me as schizophrenic. Like, one episode would be dead serious and he'd be contemplating genocide or some shit and then the next episode he's just wearing those Sonic Sunglasses and playing an electric guitar. He had potential to be a character like William Hartnell's Doctor, but instead they made him try to be some cool grandad.