基克尔(约翰·巴里摩尔 John Barrymore 饰)是一名知识非常渊博的科学家,他将毕生的经历都投注到了探索人性的善恶奥妙之中,并且最终制造出了一种可怕的药剂,这种药剂能够令基克尔化身成为海德先生,基克尔将自己所有的恶意和坏念头都投射到了海德的大脑里。白天,基克尔行医救人乐善好施,待到夜幕降临,海德先生便会现身,杀人害命,无恶不作。 基克尔有一位名叫伊芙(妮塔·纳尔迪 Nita Naldi 饰)的未婚妻,两人之间的感情非常的要好,然而,海德先生的存在让基克尔不自觉的被名叫碧翠丝的放荡妓女所吸引。分裂的人格让基克尔感到万分的痛苦,他想要消灭海德先生。Based on the Robert Louis Stevenson story: Doctor Henry Jekyll's enthusiasm for science and his selfless acts of service have made him a much-admired man. But as he visits Sir George Carew one evening, his host criticizes him for his reluctance to experience the more sensual side of life. Sir George goads Jekyll into visiting a music hall, where he watches the alluring dancer Gina. Jekyll becomes fascinated with the two contrasting sides of human nature, and he becomes obsessed with the idea of separating them. After extensive work in his laboratory, he devises a formula that does indeed allow him to alternate between two completely different personalities, his own and that of a brutish, lascivious person whom he names Hyde. It is not long before the personality of Hyde begins to dominate Jekyll's affairs.