This film is definitely amongst the worst of 1970's trash. It's loosely based on a late 1960's Spider-Man plotline. Basically someone finds a rock that fell to earth, then every time a full moon shows, he turns into a murderous beast. The whole thing is pretty dumb and frankly shouldn't have been made in the first place. Add to it one of the worst songs and a showing of the band that drags the plot to a screeching halt for no good reason, and you've got this turkey.
Avoid if possible.
Avoid if possible.