Mary Lou returns from the second sequel (both of which have nothing to do with the original) and is up to he old tricks. She becomes involved with a teenager named Alex who is the only one who can see her and the finger is pointed at him when the murders begin to happen. This one falls under the dreaded (for me anyway) horror-comedy genre. I did not find it very funny nor scary which is a cardinal sin for this type of movie. I mean we're not talking Student Bodies or Microwave Massacre here. The one thing it does have going for it is it has some decent and inventive gore. Overall, if you're looking for cheese you might enjoy it, but I don't think I'll ever want to see this one again.
Edit: I was under the influence when I saw it and even that didn't help matters much.