With episode spoilers, Doctor Who screenwriter Inua Ellams unpacks the inspirations behind his Lagos-set episode "The Story & The Engine."

Doctor Who fans talk a good game about how the series can go anywhere and be anything, but it's comparatively rare that an episode comes along that feels genuinely new. Last year offered us '73 Yards' – a real one-off that quickly became a strong contender,

Here's what Ariyon Bakare had to share about Doctor Who Season 2 Episode 5: "The Story and the Engine" and his role as a mysterious barber.