The rock band Killer Barbies is on tour across Spain when their van breaks down. They are invited by a dark stranger into a dark castle with a dark secret: the countess reached the age of Methusalem by drinking blood of young people. Such as... yes, rock band members. "Killer Barbys" suffers from the problems you could easily predict for a movie that is basically a mere promotion support for a band: poor acting (Aldo Sanbrell is the only exception), low budget, same old story. But it is clearly better than its sequel "Killer Barbies vs Dracula" in the whole atmosphere. The foggy castle is full of strange props like dolls without eyes, clocks, bones, barred windows... spooky! So, if you don't mind the silliness, gore and nudity, it's a "good bad flick". I dare say it even was the beginning of Jess Franco's return in the 90s when he seemed to fade away into oblivion.
