“Dreamcatcher” (* out of four) was a nightmarishly awful horror thriller about two estranged sisters (Nikki Koss and Elizabeth Posey) who endure a traumatic experience at a music festival and are subsequently entrenched in a lurid whirlwind of torture and terror and violence. Horrendous horror show is low-rent, ugly, and pretty unwatchable. Not related to the Stephen King novel or the 2003 film version and is hardly worth “catching.”