Although Cauldron of Blood (1970), Isle of the Snake People (1971) and Alien Terror were all released later, Curse of the Crimson Altar (1968) was actually Boris Karloff`s last completed film. At 82, he caught pneumonia (reportedly as a result of his work in the damp manor scenes) and succumbed to it a few weeks after filming.
Alas, Karloff’s swan song is not an ideal exit, even if he is the most redeemable element of Curse. That assessment is completely without nostalgic sentiment. Karloff heads a genre dream cast: Christopher Lee, Barbara Steele and Michael Gough. Stills from the film suggest a potential weird movie lover’s delight, but that potential is squandered through direction and writing that is too pedestrian to even be unintentionally bizarre.