Doctor Who episode 197: The Web of Fear – Episode 6 (9/3/1968)
In the very final analysis, this is a bit of a cop-out ending. The Doctor’s spent the last week and a half coming up with a clever plan to foil the Intelligence, but ultimately he doesn’t get to carry it our because Jamie jumps the gun, uses the hacked Yeti to attack its peers, and wreck the Intelligence’s machine. There’s a lot of chaos, a big explosion, and then it all wraps up in about three minutes as the Doctor bemoans Jamie’s actions and warns that the Intelligence is still out there: ‘It might come back.’