The song features Sonja Kraushofer from L'Âme Immortelle doing about half the lines.
Dero is a mad scientist and Crap and Flux are his "medical" assistants, bringing monsters to life.
They have already created a monster like Frankenstein's, and now they are working on a female, presumably to become Dero's bride instead of the male monster´s.
In the video, the male monster works as an assistant, but when the monster picks the chosen brain for the female he accidentally dropped the brain, so he takes a different one; Dero gets suspicious but he and the rest of the band continue working.
The monster chokes Dero (and maybe Flux and Crap) to death and takes his brain and those of the other band members in three beakers full of embalming fluid and the two monsters leave the lab.