The Faceless Ones (aka The one where Gatwick Airport payed the Doctor Who production team to film a story there as product placement for their flights because goshdarnit don't go to that Heathrow dump or you'll get AIDS) was a story from Season 4 about aliens with no identity stealing passengers to get some.
It starred Patrick "No I haven't got a passport" Troughton as Recorder Overlord and Frazer Hines as Jamie "IT'S A FLYING BEASTIE" McCrimmon. Oh, and also Michael Craze as Ben and Anneke Wills as Polly for two seconds before they get kidnapped and fuck off home Dodo Chaplet style, though at least they actually get a proper goodbye scene at the end unlike her. Also there's some chick who'd end up playing Queen Victoria in a far more inferior story.
Gatwick Airport saw a 100% decrease in their flight bookings during the 6 week broadcast because this was in the time period when audiences believed that the entertainment they were watching was really happening, sorta like when The War of the Worlds was first broadcast. As a result of this, the viewing copies of this story were destroyed to appease the easily triggered 60s viewers, although copies of episode 1 & 3 missed the incinerator. Shame that they all didn't miss it, because this is actually a genuinely good story.
Still better than The one where Heathrow Airport payed the Doctor Who production team to film a story there as product placement for their flights because goshdarnit don't go to that Gatwick dump or you'll get AIDS.