Split

The story of Split follows Kevin Wendell Crumb, a DID system who kidnaps and imprisons three teenage girls. Several members of the system worship a malicious system member they refer to as The Beast, which displays enhanced physical strength, extreme healing capabilities, and animalistic tendencies. Said members conspire to deny the more reasonable system members access to the front in order to allow The Beast to manifest and cleanse the world of the "impure" who have not suffered, and when their plan succeeds, The Beast kills the system's therapist and two of the kidnapped girls, before noticing the third's scars from being abused by her uncle and leaving her alive.

Split is the second in a trilogy of movies by M. Night Shyamalan, and the system it follows also appears in the third movie, Glass, as a primary antagonist who has been used as an experimental test subject in an attempt to weaponize the enhanced abilities of The Beast. While Glass is slightly less blatantly gross in its representation as Split, it still carries many of the same content warnings.