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.

The 100

Pilot

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.

Earth Skills

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.

Earth Kills

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.

Murphy's Law

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.

Twilight's Last Gleaming

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.

His Sister's Keeper

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.

Contents Under Pressure

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.

Day Trip

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.

Unity Day

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.

I Am Become Death

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.

The Calm

Should they stay or should they go:  Those remaining on the Ark must come to terms with the inevitable.  Meanwhile, Clarke and Finn find themselves facing a new enemy.

We Are Grounders - Part I

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.

We Are Grounders - Part II

Pluto

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

Die All, Die Merrily

In the fourth season premiere, Clarke (series star ELIZA TAYLOR) and her friends struggle with how to proceed after the fate of the world is revealed.

Echoes

The burden of leading weighs heavily upon Clarke and Bellamy when different challenges force them to determine who will live and die.

Heavy Lies the Crown

As tensions rise in Arkadia and Polis, Jaha leads Clarke and Bellamy down a road toward possible salvation.

The Four Horsemen

While Abby leads a team to a distant location, hoping to find answers, the continued struggles with leadership and trust in Arkadia and Polis take a violent turn.

A Lie Guarded

Clarke makes a desperate plea with a former allied force in an attempt to avoid a war and ensure the survival of her people.

The Tinder Box

Clarke and Roan (series star ZACH McGOWAN) must work together in hostile territory in order to deliver an invaluable asset to Abby and her team.

We Will Rise

Clarke's arrival on the island quickly takes a turn for the worse.  Meanwhile, Bellamy tries to avoid further tragedy in Arkadia.

Gimme Shelter

After a disappointing discovery, Clarke and Abby question how far they're willing to go.  Meanwhile, Jaha finds a lead to the mysterious Second Dawn.

God Complex

Jasper and Bellamy go on a quest. Meanwhile, Clarke struggles to keep the peace after word of Jaha's discovery spreads.

Series star Henry Ian Cusick directs the episode in which Clarke faces the consequences of her fateful choice.

The Other Side

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

The Chosen

In the season finale, it's a race against the end of the world as Praimfaya arrives, forcing our heroes to make impossible choices to ensure their survival.

Praimfaya

After an exile in space, human survivors return to a wildly transformed Earth…only to discover that the human race never truly left. Staking out their place in this world, they face the peril and dilemmas that come with rebuilding society.

Die All, Die Merrily

Full Episodes

Season 4, 13 episodes