Frank (Art Hindle of THE CLONEMASTER) sees some bruises on his five year old daughter's back and is concerned that his ex-wife, Nola (Samantha Eggar of CURTAINS) has beaten her just like her mother had beaten her. He goes to the clinic where she's undergoing some experiment therapy called Psycho-plasmics but Dr. Raglan Oliver Reed) won't let him see her. He says she's undergoing intense therapy and can't be disturbed. Well, she's already disturbed. Then, people associated with Frank areo murdered, such as his in-laws. First, the mother is killed in her house by what looks like a child, then the husband when he comes in for the funeral. Finally, the daughter's elementary school teacher since the wife views her as a threat. She, after all, wants her family back together. The daughter is taken by these strange creatures, which aren't exactly human.
The father does some research on the doctor and finds some unhappy patients, one of whom is being eaten alive by lymphomic cancer. Another patient, recently kicked out of the clinic, tells of some disturbed children that his ex-wife is caring for. So he goes to the isolated facility and confronts the doctor. Now, the doctor is having second thoughts on his research and realizes he has screwed up. He explains that these are not children at all but manifestations of her rage and that she controls them. They have Frank's daughter up in their loft. The doctor says he'll go get the girl if Frank talks to his crazy wife and keeps her calm. But he's repulsed by what he sees--and the weird creatures begin to awaken and attack.
I haven't seen this movie in at least fifteen years and it holds up well over time. I always thought this was one of Cronenberg's better movies.