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Attack of the Giant Leeches (1959)
After local-moonshine swilling trapper Lem Sawyer sees a giant creature, people start disappearing. While searching for illegal traps Steve Benton and Nan Greyson, his girl-friend find Lem dying with giant sucker wounds on his body. One couple Liz Walker and Cal Moulton, forced into the water by her enraged husband Dave Walker, gets taken by the leeches.