Doctor Who episode 722: Bad Wolf (11/6/2005)
‘Someone’s been playing a long game.’ The first of RTD’s season finales sets the tone for years to come, with an opening half packed with pop culture references leading to a cliffhanger that puts the whole Earth in danger. A crucial difference, though, it’s the Earth of 200,100 AD: it’s not Jackie or Wilf cowering down there as the skies fill with Dalek spaceships. It’s made relatable through Lynda (who might as well have been one of Rose’s colleagues, there’s no suggestion she’s a cyborg transhuman from Jupiter for example), but it’s still an unfamiliar, unvisited place, choked by the Great Atlantic Smog Storm and with a murderous approach to gameshows.