The cover of Robert Louis Stevenson’s ‘Dr. Jekyll and Mr. Hyde.’ | Penguin Random House (book cover), Justin Dodd/Mental Floss (background) ...

“I’ve always thought Jekyll and Hyde,” Whannell explained. “That book, when I was a kid, really creeped me out, the concept of it. Of all the monsters, that one used to really stay with me.

The names Jekyll and Hyde have been integrated into our everyday language. Even those unfamiliar with the book (and its many adaptations and riffs) know that “Jekyll-Hyde” means twinned good ...

Learn more about the full cast of Dr. Jekyll and Mr. Hyde with news, photos, videos and more at TV Guide ...