Doctor Who episode 257: Spearhead from Space – Episode 4 (24/1/1970)
Everyone is putting a lot of effort into making this gripping and actually scary: the creepy doll factory; the waxworks at night; a pulsating sphincter in fish tank; faceless shop dummies jerking to life and smashing their way out. Derek Martinus directs it effectively with fast cutting, as scenes and conversations happen in parallel. It has a real pace, and – given the budget – a sense of scale. We only see about three Autons and a dozen civilians in the famous Ealing high street scene, and famously no glass was damaged in the making of it, but it leaves the impression of something much more spectacular.