A potent new cannabis strain called "Black Forest" has captivated Los Angeles, particularly drawing in Gretel’s boyfriend, a dedicated stoner. Trouble arises when they discover that the elderly woman cultivating this sought-after weed is a malevolent witch who devours her inebriated customers to maintain her youth. With time running out, Gretel and her brother Hansel are forced into a desperate mission to rescue him from a horrific fate, or risk experiencing their final, deadly high.