Q.E.D. (1982)

Return of the Bloodsuckers (1996x9)

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Despite its unpleasant image, the leech has made a remarkable comeback to the modern operating theatres of hospitals around the world. Moreover, Dr Roy Sawyer , who runs the world 's first leech farm in Wales, believes that these bloodsuckers' saliva could hold the key to the treatment of heart attack and stroke victims.