Mildred Moyer transforms from shy misfit to loveable psychopath when her back-alley plastic surgery is botched. Mildred finds herself living her best life as she unleashes brutal vengeance on all those who tormented her in the past.

A group of people go on a "serial killer" tour, visiting the sites where legendary deceased murderer Zacharias Cook slaughtered his victims, only to find the killer isn't dead and now has his sights set on them.

In an effort to escape his past and sober up, a man hides away at a remote property, unknowingly checking into the Glass family's haunted house from I'm Haunted 3.