This is an amazing film from our friends in Mexico. I give it five stars for hilarity and pompousness in equal combinations. You will be unable to stop rolling your eyes at this film.
The premise is that in 1661 this guy, Baron Vitelius of Astara, was burned as part of the Inquisition in "New Spain" (Mexico), and he vows revenge on the descendents of those who wrongfully executed him in 300 years, when the comet that was overhead at the time of the execution returns. We know he is serious, because he appears to have ill defined magical powers, including the power of invisibility, which for some reason he does not use to escape the fire.
In 1961, right on schedule, the comet returns, the Baron riding along with it, only now he is the Brainiac, a monster who must eat human brains. The comet needs an aside here: never before has a comet looked this hokey in all of film history (you simply must see this for yourself), and secondly, the comet lands (!) by gently dropping to the ground with a thud. It appears to be papier-mache. No smoke, no crater, nothing. Then Brainiac gets out. Amazing.
Brainiac is able to transform himself into a suave Baron who eats brains out of a casserole dish after he removes them (intact, somehow) from his victims skulls using his tubular, bifurcated tongue while in his Brainiac form. After we meet the Brainiac we get to a long monologue that was not dubbed into English, so perhaps it was a great scene, but somehow I doubt it. In the end he succeeds in killing the descendants of his old rivals and meets his own demise, oddly enough through the genius of special effects, in his underwear.
The special effects throughout this film are delightfully bad, and none is worse than the puffy, hyperventilating Brainiac himself with his rubber forked tongue and hairy hooves that he uses like big, hairy tweezers.
This movie is so bad you almost feel sorry for it. It is un-scary and tedious, yet pompous, pretentious, and so badly executed that like a train wreck, it is impossible to look away.