Clarke (Eliza Taylor) and Finn (Thomas McDonell) escape one dangerous situation only to find themselves faced with a new enemy. Bellamy (Bob Morley) makes a heroic move to save Jasper (Devon Bostick). Raven (Lindsey Morgan) faces a new danger, and Murphy (guest star Richard Harmon, "Bates Motel") finally gets his revenge. Meanwhile, those remaining on the Ark are coming to terms with the inevitable.