Doctor Who episode 338: Frontier in Space – Episode One (24/2/1973)
This opens with two weary space pilots having a conflab about current affairs and how tough their jobs are, exactly like every other Doctor Who story for the next 16 years. Here, though, it feels like a novelty: it’s so long since we’ve seen anything like it, or had two consecutive serials not set in contemporary Britain. And then they nearly collide with the TARDIS in hyperspace, establishing the new normal so comprehensively it feels quintessential. Possibly as a running joke, it turns out that the TARDIS has landed in yet another storage hold, and Jo’s relatively blasé reaction establishes her increasing familiarity and comfort with space travel, as part of a low-key but admirable effort to give her a bit more character development than most previous companions. I particularly enjoyed her sarcastic ‘fascinating’ when the Doctor is giving a scientific explanation.