Ninety-seven years after the planet Earth was destroyed, generations of survivors are faced with dwindling resources.

Having discovered that Jasper may still be alive, Clarke leads a rescue party on a mission to locate him, but the group are shocked at what they find.

In an attempt to treat Jasper's infected wounds, Clarke, Finn and Wells set out in search of a seaweed-like plant to make an antibiotic poultice.

After the shocking death of one of their own, Clarke and Finn grow closer as they try to figure out a way to communicate with the Ark.

Clarke's fledgling romance with Finn is threatened by a new arrival. After being knocked out in a fall, Octavia wakes up to find a Grounder watching her.

Bellamy leads his crew into Grounder territory as they search for Octavia in the forest. Raven can't help but notice the deep connection between Finn and Clarke.