No one could be more meek than poor Henry Jeckyll, scampering to and fro to the whims of both his fiance and his mother. So when he invents a potion to make weak men brave (well, it started out curing seasickness), what better subject to use it on than himself? It not only makes Jeckyll more aggressive, but allows him to grow a lot more hair. After only one treatment of his potion, he soon finds himself dodging the police and explaining just how that horse got in his surgery. Throw in a wise-cracking servant, a whining fiancee, an overbearing mother and a man-hungry sister and suddenly his well-ordered life becomes one long alibi. On top of all this, he soon finds himself turning into the crazed Sir Hyde even without drinking the potion!