 Unknown to anyone, however, Dr. Jekyll has developed an injectable serum which transforms him into Mr. Hyde (the "monster" responsible for the recent murders).When Jekyll notices Vicky's and Bruce's mutual attraction, he has more thoughts of murder, injects himself, and transforms once again into Hyde (with the intent of murdering Adams).Meanwhile, Tubby and Slim decide that in order to get back on the police force they must capture this "monster" (Hyde).