Watch Medusa for Free: How to Stream the Movie Online at 123Movies. . By day, Mari and her friends broadcast their spiritual devotion through pastel pinks and catchy evangelical songs about purity and perfection, and by night they form a vigilante girl gang, prowling the streets in search of sinners who have deviated from the rightful path. After an attack goes wrong, leaving Mari scarred and unemployed, her views of community, religion, and her peers begin to shift.