Madman. 1981.
At a summer camp, teens are told of a story and as a joke they call out name "Madman Marz" soon after they are stalked and killed.
With the suspense and terror of Friday 13th and a creepy looking villain like Cropsy from The Burning, someone decided summer camp slashers were the way to move forward in the horror genre. The set up is done decently like a campfire tale and back ground of the Madman Marz who butchered his family and cue silly teens. We see the shadows, then the growl but it ain't bigfoot. The cinematography is done decently and well directed even though it may have a slow pace in between, certainly fun and enjoyable.
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