Some monks living on a hill are being terrorised by some giant furry things that may or may not be yeti. A mad explorer tries to get them to eat the Doctor (the yeti, not the monks) but they’re not interested because they’ve been trained by someone invisible who sounds like a pervert. The Doctor realises that the yeti’s one weakness is their balls.

A sure fire way to incapacitate the male of any species; No wonder they feel abominable.