Pilot

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.

Earth Skills

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.

Earth Kills

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.

Murphy's Law

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.

Twilight's Last Gleaming

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.

His Sister's Keeper

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.

Contents Under Pressure

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.

Day Trip

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.

Unity Day

Finn arranges a meeting with Clarke and the leader of the Grounders in order to bring peace, however a sceptical Clarke warns Bellamy, who along with Jasper and Raven follow them to the meeting with weapons. On the Ark, Diana takes over the exodus ship.

I Am Become Death

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.

The Calm

Clarke and Finn are captured by Anya, who forces them to save the life of a victim of the explosion. Meanwhile, Raven deals with her split from Finn, and Kane fights to save the Ark and it's survivors.

We Are Grounders (1)

Clarke and Finn come face to face with a new enemy after Lincoln rescues them from Anya, while Bellamy, Raven, Octavia and Jasper deal with a vengeful Murphy. On the Ark, Jaha makes a plan to try and get to Earth.

We Are Grounders (2)

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.

The 48

Clarke is still on her own in the white room, frantically attempting to make sense of her bizarre surroundings. Lincoln and Octavia's plan is ruined and an enemy returns.

Inclement Weather

Clarke wants answers from the President. Abby performs emergency surgery. Octavia will do anything to find Lincoln.

Reapercussions

After discovering a horrifying project in Mount Weather's medical ward, Clarke joins forces with an unexpected ally.

Many Happy Returns

Clarke ends up being betrayed by somebody that she trusted. Bellamy, Finn and Murphy attempt to save a stranger.

Human Trials

Kane takes part in a mission to make peace with the Grounders. Jasper decides to take part in a risky experiment. Lincoln enters a world of pain and President Dante Wallace issues a warning.

Fog of War

Tensions are running high between Clarke and Finn. Raven finds out that Mount Weather is interfering with their communication systems.

Long Into an Abyss

Bellamy is able to get Clarke to agree to accompany him to the drop ship. Dr. Tsing is in charge of a deadly experiment.

Spacewalker

Clarke comes back to Camp Jaha with some shocking news. Finn has to face the consequences of his actions.

Remember Me

Lexa and Clarke manage to make a deal.The newly created alliance is under threat. Monty comes up with a plan.

Survival of the Fittest

Lives are left in danger following the arrival of a new threat. Lincoln and Bellamy decide to break into Mount Weather.

Coup de Grâce

Lincoln and Bellamy's efforts to get into Mount Weather has some brutal consequences.

Rubicon

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.

Resurrection

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.

Bodyguard of Lies

Lexa and Clarke get into a heated discussion during battle preparations; Bellamy races against time.

Blood Must Have Blood (1)

Wick and Raven are faced with a setback. Maya and Jasper witness a terrible act.

Blood Must Have Blood (2)

Jaha makes a surprising move. Clarke gets help from an unexpected source. Lincoln seeks revenge.

Wanheda (1)

Three months have passed since the tragedy at Mount Weather and our heroes learn that a bounty has been put on Clarke’s head. Unbeknownst to Clarke, a team led by Bellamy and Kane journeys deep into Grounder territory to save her. Meanwhile, Murphy finds his way to the mansion and discovers a very different Jaha on a very different mission.

Wanheda (2)

Bellamy and Kane risk life and limb to rescue Clarke. In an attempt to avoid worrying about her daughter, Abby focuses on whether to open Mount Weather as a medical facility. Meanwhile, Murphy plots to betray his former Chancellor.

Ye Who Enter Here

Clarke wrestles with a decision. Bellamy learns that something isn't what it seems. Meanwhile, Murphy plots to betray his former Chancellor.

Watch the Thrones

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

Hakeldama

Pike's twisted crusade threatens Clarke's attempts for peace. Raven becomes a target, while Murphy tries to conspire against Jaha.

Bitter Harvest

Clarke is torn between vengeance and mercy. Meanwhile, Kane and Octavia work together to avert a disaster, and Abby continues to worry about Raven.

Thirteen

Lexa tries to maintain peace and order within the clans, and Clarke uncovers a strange and game-changing truth. Meanwhile, a flashback takes us into the darker chapter of humanity’s past.

Terms and Conditions

Kane is searching for a peaceful way to handle things but soon realizes he may be forced to resort to drastic measures. Meanwhile, Pike suspects that there may be a leak within the walls of Arkadia. Lastly, Raven has a plan and reaches out to Jasper for help.

Stealing Fire

Clarke discovers a shocking truth, and Octavia is forced to make a decision that could have devastating consequences. Meanwhile, Kane and Abby share a moment.

Fallen

Jaha employs a terrifying new method to convince Abby to join his cause, Kane is on a mission, and Bellamy is hit with a hard truth. Meanwhile, Monty finds himself in a precarious situation, and Jasper rushes to save one of his own.

Nevermore

Alie forces Raven’s dark side to come out, and Jasper’s anger continues to grow. Meanwhile, Octavia wrestles with her place in the world, and Monty is forced to make a split second decision.

Demons

Jaha returns to Polis, and Murphy has a surprise encounter. Meanwhile, Octavia uncovers a clue.

Join or Die

Clarke is on a mission that could change everything. Meanwhile, Murphy gains insight that might prove useful in ensuring his survival. Lastly, Kane reaches a breaking point.

Red Sky at Morning

Clarke, Bellamy, Octavia and Jasper hit a tragic roadblock. Meanwhile, Raven and Monty make an important discovery.

Perverse Instantiation (1)

Clarke finds hope in the most unlikely place. Meanwhile, Alie’s master plan comes together.

Perverse Instantiation (2)

Our heroes begin to face the reality of their tragic situation. Everyone prepares for a final showdown.

Echoes

Clarke and her friends struggle with how to proceed after the fate of the world is revealed.

Heavy Lies the Crown

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

The Four Horsemen

Jaha leads Clarke and Bellamy down a road to possible salvation while tensions rise in Arkadia and Polis.

A Lie Guarded

Continued struggles with leadership and trust in Arkadia and Polis take violent turns while Abby leads a team to a distant location hoping to find answers.

The Tinder Box

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

We Will Rise

Clarke and Roan are forced to work together when they are tasked to deliver a dangerous but crucial asset to Abby through enemy territories.

Gimme Shelter

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

God Complex

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.

DNR

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

Die All, Die Merrily

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

The Other Side

Clarke faces the consequences of her fateful choice.

The Chosen

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

Praimfaya

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

Eden

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

Red Queen

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

Sleeping Giants

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

Pandora's Box

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.

Shifting Sands

Octavia leads her people towards Shallow Valley against the advice of Clarke and Bellamy. Meanwhile, Kane and Abby adjust to a new set of challenges.

Exit Wounds

Kane's attempt to prove himself useful tests Wonkru's allegiance to Octavia. Madi faces an unexpected threat inside Wonkru, forcing Clarke to make an unlikely ally.

Acceptable Losses

Clarke and Bellamy make a startling discovery about Wonkru’s battle plans as Echo risks her friendship with Raven to complete her mission.

How We Get to Peace

Clarke’s determination to protect Madi puts Bellamy in an impossible position.

Sic Semper Tyrannis

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

The Warriors Will

Monty strives to show Wonkru an alternative to war, and to the valley itself. Meanwhile, Abby’s health continues to deteriorate, along with McCreary’s patience.

The Dark Year

As Clarke races to save Abby, she learns more about the trials and tribulations Wonkru faced in the bunker, and the impossible decisions they were forced to make in the dark year.

Damocles (1)

Octavia leads her people into war. While behind enemy lines, our heroes must overcome their differences to save Wonkru from extinction.

Damocles (2)

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.

Sanctum

Still reeling after receiving Monty’s message, a small group goes down to explore the mysterious new planet. Back on the Mothership, several members of Wonkru face the consequences of their decisions.

Red Sun Rising

The team on the ground flights to survive the threat they face on the new planet. Meanwhile, Raven must join forces with an unlikely ally to save everyone on board the Mothership.

The Children of Gabriel

Clarke tries to win over the leaders of Sanctum in order to let her people stay. Meanwhile, Bellamy, Echo and Octavia discover a new threat while on a mission to retrieve the transport ship.

The Face Behind the Glass

Clarke embraces the traditions of Sanctum and tries to make amends for her past actions.

The Gospel of Josephine

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

Memento Mori

Diyoza learns more about the mysterious Children of Gabriel while Abby continues searching for a way to save Kane.

Nevermind

Clarke’s past catches up to her.

The Old Man and the Anomaly

Octavia and Diyoza make their way to the mysterious anomaly in search of the Old Man. Meanwhile, Murphy has an offer for Emori.

What You Take With You

Bellamy must venture into enemy territory with an unlikely companion. Meanwhile, Octavia is forced to confront her past.

Matryoshka

Russell seeks justice. Meanwhile, Gabriel must make a difficult choice. Lastly, the Blake siblings reunite.

Ashes to Ashes

Bellamy and Octavia must work together to save their friends. Echo is forced to face her past.

Adjustment Protocol

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

The Blood of Sanctum

Sanctum becomes a battleground between the devout and the non-believers. The mystery of the anomaly deepens.

From the Ashes

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

The Garden

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

False Gods

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

Hesperides

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

Welcome to Bardo

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

Nakara

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

The Queen's Gambit

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

Anaconda

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

The Flock

Murphy and Indra must defuse a tense situation. Old friends make new allegiances.

A Little Sacrifice

Sheidheda makes his move. A Disciple goes rogue.

Etherea

Where in the universe is Bellamy Blake?

The Stranger

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

Blood Giant

The red sun derails Clarke's plans.

A Sort of Homecoming

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

The Dying of the Light

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

The Last War

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