The Intruder - 1975!?

From Bloody-Disgusting

This one came out of nowhere.  Apparently there was a slasher made in 1975, predating the 80's craze and sitting right smack in the middle of Black Christmas and Halloween.  Never released in theater or home video; The Intruder is coming to boo-ray 8/1/17.  Color me interested as hell.