Watch The Slasher for Free: How to Stream the Movie Online at 123Movies. . New York is under the gripping threat of a masked madman killing beautiful women with no end in sight. As bloody, naked bodies are turning up everywhere, 'The Slasher' holds the city in his tightened grip. Two hard-boiled cops who've seen it all remain hot on the trail of the maniac, but the meddling of the press and the evil genius of their prey keeps them one step behind.