Terrified of sheep and dosed up on therapy, Henry Oldfield (Nathan Meister) returns to his family's farm to sell out to his older brother Angus (Peter Feeney), unaware that something baaaad is going on: Angus' reckless gentic engineering program. When a pair of inept environmental activitsts release a mutant lamb from Angus' laboratory onto the farm, thousands of cuddly sheep are turned into bloodthirsty predators. Along with farmhand Tucker (Tammy Davis) and greenie girl Experience (Danielle Mason), Henry finds himself stranded deep on the farm as his worst nightmare comes to life.