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Clarke and her friends must risk everything to fight one last battle for survival, only to glimpse an even darker threat to the last living valley on earth.

After being betrayed by Lexa, Clarke makes a final stand against Mount Weather, while Jaha shocks Murphy as they continue their journey to the City of Light.

It's a race against the end of the world as Praimfaya arrives forcing our heroes to make impossible decisions to ensure their survival.

Octavia fights in the final battle for survival, but not everyone is willing to play fair.

Clarke confronts a new adversary. A surprising connection takes us back to the past and the nuclear apocalypse that destroyed the Earth.

As the remaining members of the 100 face off against the Grounders, Jaha makes a noble sacrifice to ensure the Ark makes it to Earth.

Camp Jaha butt heads over what to do with Finn, as flashbacks show his and Raven's relationship on the Ark.

Bellamy leads the charge investigating a potential way home. Meanwhile, Clarke and Madi deal with the new, uncertain threat to their home.

As the Grounder army prepare to attack Mount Weather, a desperate Cage turns to Dante for help, and Raven and Wick experience a major setback.

As Jaha and Murphy encounter a perilous obstacle on their journey, Raven and Wick try to figure out how to disable the acid fog, and Bellamy races against time as his cover is blown.

In part one of the fifth season finale, Octavia leads her people into war. While behind enemy lines, our heroes must overcome their differences to save Wonkru from extinction.

Bellamy receives help from an unlikely source after being captured. Meanwhile, Abby fights to stay in control, and Jasper confronts President Wallace.

Now with Clarke in her possession, Lexa has the power to force Skikru to become one with the grounders. Kane and Abby journey to the Polis Summit, while the Ice Nation prepares to draw first blood against Skikru and the other grounder clans.

Jaha and Kane disagree over how to handle their grim reality. Meanwhile, Clarke leads a group to save a friend.

Octavia is forced to take guidance from an unlikely ally when the future of the bunker and all those inside it is jeopardized.

Clarke begins to question Lexa's leadership decisions and Indra continues to push Octavia. Meanwhile, at Mount Weather, Jasper steps up into the role of leader, and Cage throws Maya into a life threatening situation.

Clarke struggles to survive on a desolate, scorched earth while her friends in space come across a long awaited beacon of hope.

Jordan investigates Sanctum. Meanwhile, Octavia and Diyoza discover the threats of the new planet firsthand. Lastly, Bellamy and Clarke butt heads.

A special Naming Day changes everything in Sanctum. Gabriel comes face to face with an old friend.

Octavia gets to know a whole new world. Meanwhile, Murphy and Emori play make believe.

As Abby and Jaha each try to establish their authority, Clarke comes up with a plan to stop the Grounders' attack. At Mount Weather, Jasper, Monty, Miller and Harper plan their escape, as Dr. Tsing and Cage conduct deadly experiments.

Clarke is faced with a difficult choice and Raven helps Bellamy navigate Mount Weather as Dr. Tsing begins to harvest the 47, while Jaha and Murphy encounter a stranger on their journey to the City of Light.

Clarke discovers the mastermind behind a devious plan, while Kane struggles to keep the peace. Meanwhile, Jasper's grief drives him to reckless behavior.

Our heroes are forced to rely on the help of Shallow Valley's dangerous new inhabitants in order to save some of their own, with surprising results.

The growing fractures in Wonkru threaten to explode once and for all. Meanwhile, in Shadow Valley, Murphy starts a fire, unleashing catastrophic results.