“He’s done awful things to people, and he’ll do awful things to you.”

Ever since I read Sybil (based on the controversial diagnosis of Shirley Ardell Mason), I’ve been fascinated by “Multiple Personality Disorder” (now called Disassociative Identity Disorder.)  While it’s heartbreaking to think of the extremes someone must have gone through to have their personality shatter like that, it does make for fascinating reading/watching.  (#Protip: the autobiography of Trudi Chase, When Rabbit Howls, is also must-read.)

So it’s no wonder that M. Night Shyamalan picked up on this diagnosis, and wove it into his newest film, Split.  Snopsis!

Though Kevin (James McAvoy) has evidenced 23 personalities to his trusted psychiatrist, Dr. Fletcher (Betty Buckley), there remains one still submerged who is set to materialize and dominate all the others. Compelled to abduct three teenage girls led by the willful, observant Casey (Anya Taylor-Joy, The Witch), Kevin reaches a war for survival among all of those contained within him—as well as everyone around him—as the walls between his compartments shatter apart.

McAvoy is riveting in this trailer, and I can’t wait to see how he really digs in, especially with Buckey’s psychiatrist.  (Seriously; who doesn’t love Betty Buckley?)  Plus, I’m glad to see more of Morgan‘s Taylor-Joy.

Split hits theaters January 20th.