Clarke's (Eliza Taylor) newfound romance with Finn (Thomas McDonell) is threatened. Octavia (Marie Avgeropoulos) suffers a blow to the head and wakes up to find a Grounder watching her. On the Ark, Abby (Paige Turco) exposes Kane's (Henry Ian Cusick) plan to reduce the population of the Ark. Jaha (Isaiah Washington) and Abby (Paige Turco) notice a signal and realize at least some of the 100 must still be alive on Earth.