Night Terrors

Set after Spearhead From Space. The Doctor and Liz set out alone together to explore multiple suicides and catastrophes at a distant, isolated village. But horrifying events point to the return of a creature called Gall Farraneagh. According to local legend, he can be appeased only by human blood, and only that torn from women and girls. When the village's long-time protector takes strong measures to rescue and educate Liz, the Doctor finds himself the odd man out, and both of UNIT's scientific advisors must decide if they are dealing with an underworld creature, or with technology run amok.