罗杰·吉拉德博士是一个丰富的科学家进行头部移植实验。他的看守有一个儿子|丹尼|谁|虽然完全长大|有心灵儿童。一天，一个逃脱心理杀手侵入芝的家|被枪杀之前，自己杀死丹尼的父亲。随着疯子死亡，丹尼深深他父亲的死感到不安|吉拉德博士决定采取最后的一步，杀手的脑袋移植到丹尼的身上。当然|事情严重错误和双头动物逃逸恐吓农村。

 Dr. Roger Girard is a rich scientist conducting experiments on head transplantation. His caretaker has a son| Danny| who| although fully grown| has the mind of

child. One day an escaped psycho-killer invades Girard's home| killing Danny's father before being gunned down himself. With the maniac dying and Danny deeply

unsettled by his father's death| Dr. Girard decides to take the final step and transplant the killer's head onto Danny's body. Of course| things go horribly wrong

and the two-headed creature escapes to terrorize the countryside.