Bellamy, Finn and Jasper head into Grounder territory to search for Octavia, as flashbacks show the siblings' difficult childhood on the Ark. Meanwhile, Raven finds out about Clarke and Finn.
Quest roles:
Lindsey Morgan(Raven Reyes), Ricky Whittle(Lincoln), Terry Chen(Commander Shumway), Monique Ganderton(Aurora Blake), Giacomo Baessato(Diggs), Victor Ayala(Horace), Fulvio Cecere(Inspector Grus), Spencer Drever(Young Bellamy Blake), Quinn Lord(Young Member of The 100), Katie Stuart(Zoe Monroe), Olivia Steele-Falconer(Young Octavia Blake), Celia Reid(Roma), Aaron Miko(John Mbege)