INVISIBLE MANIAC 1990 (REPUBLIC)

A mad scientist named Kevin Dorwinkle, who was taught by his mother the evils of women when he was a child developes an invisibility serum and uses it to kill the stupid and crude teenagers he is teaching in a summer school class.
Little do they know he has just escaped from a mental institution after killing several of his collegues who mocked him.
Noel peters does an excellent job as Kevin, who laughs like a madman when he is killing people. The other actors have to give it their all when they are having to act like they are fighting an invisible man, and they do do a good job.
The rest of the cast includes Melissa Moore, Savannha, Jason Logan and Debra Lamb.
This is easily some kind of an overlooked cult masterpiece. The murders are well done and the movie is done very seriously with a pretty cool twist you can probably guess quickly.
If you get a chance to see it do so. It's a treat for horror fans.