It's the end of the world as we know it in the first season finale as the conflict on the ground comes to a head and the situation on the Ark comes to a stunning conclusion.
Should they stay or should they go? Those remaining o the Ark must come to terms with the inevitable. Meanwhile, Clarke and Finn find themselves facing a new enemy.
With a low food supply at camp, Clarke and Finn lead a group out to hunt for food and wind up with Finn's life in danger. Meanwhile, Raven makes Bellamy an offer he can't refuse.
Murphy returns to camp claiming to have been held captive and tortured by the Grounders, and Clarke and Bellamy have very different opinions on how to handle his return.
All hell breaks loose when Clarke and Finn attempt to broker peace with the Grounders. And tragedy strikes during the Unity Day celebration on the Ark.
While some of the 100 accidentally eat hallucinogenic nuts, Clarke and Bellamy go on a mission to find supplies for winter and are brought closer by a terrifying event.
While Clarke and Raven make contact with the Ark, Abby is removed from the council and Jaha reveals that there are not enough drop ships for everyone on the Ark.
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.
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.
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.
Abby risks having herself floated in order to give Raven (recurring guest star LINDSEY MORGAN) the chance to stow-away in the escape pod bound for Earth.
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.
Having discovered that Jasper may still be alive, Clarke, Bellamy, Octavia, Finn and Monty set out on a mission to locate their friend and are shocked at what they find.
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.
In the series premiere, 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.
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