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Clarke and her friends attempt to rebuild Sanctum as a new threat rises in the woods.

Echo and Gabriel learn more about Hope and her mysterious past.

As Raven faces an unexpected threat, Clarke must keep the peace among opposing factions in Sanctum.

Mysterious outsiders arrive with news of Clarke's missing people.

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

Clarke and her friends find themselves on a planet that is not what it seems.

Emori tries to heal Sanctum's old familial wounds while Echo, Octavia and Diyoza struggle with new ones.

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

Murphy and Indra must defuse a tense situation. Meanwhile, old friends make new allegiances.

Sheidheda makes his move. Meanwhile, a Disciple goes rogue.

Where in the universe is Bellamy Blake?

It's a new day in Sanctum. Clarke, Octavia, Raven and Echo struggle with a new foe.

The red sun derails Clarke's plans.

Clarke and her friends reckon with all that has happened only to find an unexpected threat looming.

Clarke and Octavia mount a desperate rescue mission as the Disciples close in on what they want.

After all the fighting and loss, Clarke and her friends have reached the final battle. But is humanity worthy of something greater?

97 years after a nuclear war, human kind is living in space. 100 juvenile delinquents are sent down to Earth to see if the planet is habitable.

Discovering that Jasper may still be alive, Clarke, Bellamy, Finn, Wells and Murphy head out to find him. On the Ark, Abby is determined to prove Earth is habitable, and enlists a mechanic to craft an escape pod.

As a dangerous, acidic fog approaches, Clarke, Finn and Wells set out in search of a seaweed-like plant to make an antibiotic poultice for Jasper's wounds, while a vulnerable young girl follows when Bellamy takes a group out hunting for food.

Bellamy, Clarke and Finn try to protect Charlotte when everyone learns she killed Wells. On the Ark, Abby risks getting floated in order to give Raven the chance to launch the escape pod.

A plan to contact the Ark is put in motion after Raven crash lands on Earth. Meanwhile, Abby exposes Kane's plan to reduce the population of the Ark.

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.

Shumway secretly orders one of the 100 to kill Bellamy. Meanwhile, hallucinogenic nuts provide Octavia with an opportunity to help the Grounder escape the camp, and Bellamy and Clarke investigate a nearby underground depot, where they find military weapons.

While Bellamy tortures the Grounder, Raven and Clarke make contact with the Ark and ask Abby to help them save Finn. On the Ark, Kane deals with his guilt, and Jaha surprises the council with a shocking revelation.

Murphy returns to the camp carrying a horrific virus created by the Grounders to weaken the camp. After learning the Grounders plan to attack the next day, Bellamy, Finn and Raven come up with a plan to delay them.