In a desperate attempt to treat Jasper's (Devon Bostick) festering wounds, Clarke (Eliza Taylor), Finn (Thomas McDonell) and Wells (Eli Goree) set out in search of a seaweed antibiotic. Bellamy (Bob Morley) and his crew go hunting for food, and are joined by Charlotte (guest star Izabela Vidovic), a lovable 13-year-old, who feels safe under Bellamy's protection. A thick, acidic fog appears, forcing Clarke, Finn and Wells to seek shelter inside an ancient van. While they are trapped, Clarke confronts Wells on his betrayal that resulted in her father's death.
