Ignore the most negative of the comments, "The Blood Beast Terror" is not total garbage. It has the Hammer Studio's feel which it was trying to imitate; with a decent imitation of the Hammer Victorian production design and a performance by Peter Cushing (as Police Inspector Quennell). It is also features one of the few available film appearances of Vanessa Howard, unfortunately she has only a supporting scream queen role as Quennell's daughter Meg. Check out "Girly" if you want to see a lot more of this underutilized actress.
"The Blood Beast Terror's" main weakness is its low budget which resulted in some horribly lame special effects, although the budget cannot be entirely blamed as just a little imagination in this area would have resulted in something far more effective. It also suffers from a condensed story that does not supply enough scientific details to make the basic premise interesting.
So instead of a sci-fi/horror picture, it is more of a detective story with some laughable horror elements. But it is a decent detective story with enough misdirection to produce several surprising revelations. Contrary to several other comments, I had no problem with the ending, finding the idea of a moth (even a giant one) being drawn to a flame quite appropriate, although so poorly staged as to be groan inducing.
There is some great comic relief in the underplayed performance of Glynn Edwards (as Sergeant Allen) and the overplayed performance of Roy Hudd, as the jaded morgue attendant who casually eats his meals off the slabs in the morgue (complete with cadavers). There is unintended comic relief in the casting of 30 year-old Wanda Ventham as the mad scientist's on-the-make "teenage" daughter. Nothing exceptional but a cut above much of the 60's cheap sci-fi and horror.
Then again, what do I know? I'm only a child.
