Constantin Draganescu

Deep in the depths of hell a young demoness yearns to visit the world of man. She decides her mission in life is to hunt down evildoers and kill them. She meets a young doctor and despite the fact that she's a spawn of darkness he falls in love with her. But will the separation of mortal and immortal allow their love to last...?

When a lab experiment goes wrong, Benjamin Knight is left invisible while his scientist friends trying to find a formula that will restore his visibility to last the rest of his life. (imdb)

Three sequences, which could have formed separate stories, are linked together by one film crew at work on two different jobs.