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

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.

S1 E12 We Are Grounders - Part I

Full Episodes

Season 1, 13 Episodes