Terry (John Savage) was forced by his friends to partake in the gang rape of young Tina (Sue Bernard) under the boardwalk on that fateful day. It's questionable whether he could actually "perform", but regardless he ended up doing a 2-year term in the clink. Once he's out, he heads to the boarding house run by his mother Thelma (Ann Sothern) where he's treated to gallons of chocolate milk and sexually-tinged oppression.
Thelma's constant deriding of anyone else on the planet with a vagina (they're not good enough for Terry, they're all whores, blah blah blah) coupled with "affection" that's a bit too...affectionate for a mother and son have clearly rendered Terry with a muddled idea of sexuality.
He's plagued by visions of Tina under the boardwalk, and anytime he's confronted by a woman- whether a magazine photo staring back at him as he tries to masturbate or a repressed, older neighbor coming on to him, Terry flips out and loses control. Before too long, he takes revenge on those who put him behind bars, including his defense lawyer as well as Tina herself.
Terry's homicidal ways begin to worm their way into his home life once Lori (Cindy Williams) moves into mom's boarding house. Events escalate until there's a dead Shirley Feeney-to-be in the bathtub, and Thelma must finally face up to the fact that her beloved son is a certifiable cuckoo nutso.
The Killing Kind features the most inappropriate familial relationship I've had the "pleasure" of watching since I popped in Night Warning some time back. While the Terry - Thelma dynamic is going to send you running for your toothbrush the moment the credits start rolling, it's thanks to veterans Savage and Sothern that their relationship isn't just a sideshow. Each actor gives a performance hinting at the pain and loneliness that are part and parcel of what results in such antisocial behavior. It's almost impossible to like either one of them, but they're also hard to hate.
All in all, it's an expectedly solid effort from the underappreciated Curtis Harrington. The Killing Kind has the feel of an especially lurid TV movie- and that's certainly not a bad thing.