Dennis Peterson (Frederick Koehler) is mentally challenged teen who lives with his older brother John (Sean Patrick Flanery). While John struggles between caring for Dennis and maintaining a relationship with his increasingly impatient girlfriend Lydia (Diana Meyer(, Dennis finds a friend in his own reflection in an antique mirror. But in reality, the reflection is soon revealed to be an evil entity (Michael Berryman, The Hills have Eyes) who is more charming, smarter and stronger than Dennis, and instructs him to do horrific thing in order to 'fix' his brain. Dennis embarks on a murderous rampage, collecting the bodies in his basement. A police investigation targeted at the Peterson's pressures Dennis to make his final play .. with devastating results.