100 young exiles from a dying space station are sent to the planet Earth 97 years after a nuclear apocalypse to see if it's habitable.
After discovering that Jasper may still be alive, Clarke, Bellamy, Octavia, Finn and Monty set out to locate him and are shocked at what they find.
Clarke, Finn and Wells set out in search of an antibiotic to treat Jasper's wounds, when an acid fog forces them to seek shelter...and forgiveness for past crimes.
Abby risks having herself floated in order to give Raven the chance to stow-away in the escape pod bound for Earth.
After exposing Kane's plan to reduce the population of the Ark, Abby and Chancellor Jaha notice a signal from Earth and realize at least some of the 100 must still be alive.
While Bellamy leads his crew into Grounder territory in a search for Olivia, Raven can't help but notice the deep connection between Finn and Clarke.
Eliza Taylor-Cotter
Clarke Griffin
Paige Turco
Dr. Abby Griffin
Bob Morley
Bellamy Blake
Marie Avgeropoulos
Octavia Blake
Lindsey Morgan
Raven Reyes