There are so many questions unanswered about this movie. Why did Dr. Phibes use the legendary Egyptian plagues as inspiration for his murder spree? Who exactly is the beautiful Vulnavia? She never speaks, and is always there to assist Dr. Phibes. What is her relationship with the doctor? Did she know his wife personally?
I like to think of this movie as an early predecessor to Se7en. Because that guy uses the seven deadly sins to murder people, whereas Dr. Phibes uses the plagues. However, two of the plagues were replaced with rats and bats for visual reasons. You have to give him credit for being super creative though.
And not only that, he wins. He always stays two steps ahead of the police, and succeeds in almost everything he sets out to do. I will give this film a 7/10.