Dr Anton Phibes (the late great Vincent Price) is out for revenge on those who's incompetance killed his wife Victoria (Caroline Monroe) with the help of his beautiful but mute assistant Vulnavia (VIrginia North).
In the firing line are the likes of Terry Thomas who plays Dr Longstreet a porn mad surgeon who suffers the curse of blood. Joseph Cotton plays Dr Vesalius, a part that was originally meant for Peter Cushing, but Mr Cushing's wife was very ill at the time and he had to withdraw from the filming.
All the deaths follow the plagues of Egypt: curse of boils, bats, frogs, the curse of blood, the curse of rats, hail, of beasts, the locust, of course, the death of the first-born, and then, finally, of darkness.
It is one of those films where you want the bad guy to win, and played to the campest level possible. Inspector Trout (Peter Jeffrey) and Sgt Schenley (Norman Jones) add extra comic relief to the film.
A great piece of escapism, that I remember from my childhood along with the Friday night Hammer Horror movies. Absolutely wonderful regardless of the fact that there are no extras.