Set ninety-seven years after a nuclear war has destroyed civilization, when a spaceship housing humanity's lone survivors sends one hundred juvenile delinquents back to Earth, in hopes of possibly re-populating the planet.
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» Season 1
Ninety-seven years ago, nuclear Armageddon decimated planet Earth, destroying civilization. The only survivors were the 400 inhabitants of 12 international space stations that were in orbit at the time. Three generations have been born in space, the survivors now number 4,000, and resources are running out on their dying "Ark." Among the 100 young exiles are Clarke, the bright teenage daughter of the Ark’s chief medical officer; the daredevil Finn; the brother/sister duo of Bellamy and Octavia, whose illegal sibling status has always led them to flaunt the rules, the lighthearted Jasper and the resourceful Monty. Technologically blind to what’s happening on the planet below them, the Ark’s leaders — Clarke’s widowed mother, Abby; Chancellor Jaha; and his shadowy second in command, Kane — are faced with difficult decisions about life, death and the continued existence of the human race.
E02: Earth Skills
Having discovered that Jasper may still be alive, Clarke, Bellamy, Octavia, Finn and Monty set out on a mission to locate their friend and are shocked at what they find. Meanwhile, on the Ark, Abby is determined to get to Earth, and enlists Raven to craft an escape pod.
E03: Earth Kills
In a desperate attempt to treat Jasper’s festering wounds, Clarke, Finn and Wells set out in search of a seaweed antibiotic. Bellamy and his crew go hunting for food, and are joined by Charlotte, a lovable 13-year-old, who feels safe under Bellamy’s protection. A thick, acidic fog appears, forcing Clarke, Finn and Wells to seek shelter inside an ancient van. While they are trapped, Clarke confronts Wells on his betrayal that resulted in her father’s death.
E04: Murphy's Law
After the shocking death of one of their own, Clarke and Finn grow closer as they try to figure out a way to communicate with the Ark. Bellamy must keep the group from turning on one another as life on Earth takes a desperate turn. Meanwhile, Abby risks having herself floated in order to give Raven the chance to stow-away in the escape pod bound for Earth.
E05: Twilight's Last Gleaming
Clarke’s newfound romance with Finn is threatened. Octavia suffers a blow to the head and wakes up to find a Grounder watching her. On the Ark, Abby exposes Kane’s plan to reduce the population of the Ark. Jaha and Abby notice a signal and realize at least some of the 100 must still be alive on Earth.
E06: His Sister's Keeper
Bellamy leads his crew into Grounder territory as they search for Octavia. Raven can't help but notice the deep connection between Finn and Clarke. Meanwhile, flashbacks reveal Bellamy's and Octavia's childhood on the Ark.
E07: Contents Under Pressure
Clarke and Raven make contact with the Ark, and Abby guides Clarke through a dangerous procedure in a desperate move to save one of their own. Meanwhile, on the Ark, Abby is removed from the council, and former Chancellor Diana Sydney takes her place. Jaha reveals to Abby that there are not enough drop ships for everyone on the Ark to go down to Earth, and Kane begins to deal with his guilt over his recent decision.
E08: Day Trip
Clarke and Bellamy go on a mission to find supplies for approaching winter. Some of the 100 accidentally eat nuts with powerfully hallucinogenic properties and lose their grasp on reality. Meanwhile, Octavia seizes the opportunity to help a friend escape, and a terrifying event brings Clarke and Bellamy closer. On the Ark, Commander Shumway secretly assigns one of the 100 to kill one of his own, and the treacherous actions of Diane Sydney are revealed.
E09: Unity Day
Clarke and Finn attempt to broker peace with the Grounders but all hell breaks loose when Bellamy, Jasper and Raven show up armed and ready for battle. Octavia and Lincoln grow closer. Meanwhile, tragedy strikes during the Unity Day celebration on the Ark.
E10: I Am Become Death
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. Octavia sneaks away to find Lincoln and returns with a serious warning for the 100. Meanwhile, a mysterious virus strikes camp forcing many to be quarantined, and Jasper pulls off a heroic move.
E11: The Calm
With a low food supply at camp, Clarke and Finn lead a group out to hunt for food and wind up in a compromising position. With Finn’s life in danger, Clarke makes a game-changing decision. Meanwhile, Raven makes Bellamy an offer he can’t refuse. On the Ark – Kane risks his life and is reunited with Chancellor Jaha and Abby.
E12: We Are Grounders (1)
Clarke and Finn escape one dangerous situation only to find themselves faced with a new enemy. Bellamy makes a heroic move to save Jasper. Raven faces a new danger, and Murphy finally gets his revenge. Meanwhile, those remaining on the Ark are coming to terms with the inevitable.
E13: We Are Grounders (2)
Clarke pleads with Bellamy to do the right thing as conflict on the ground comes to a head. Bellamy forces Octavia to make a difficult decision. Raven and Jasper work against time and Finn makes a bold move. Meanwhile, the situation on the Ark comes to a stunning conclusion.
» Season 2
E01: The 48
Clarke is still alone in the white room, frantically trying to make sense of her bizarre surroundings, while the fate of Bellamy, Finn and Raven is still unknown. Lincoln and Octavia’s daring plan is thwarted and an enemy returns. Meanwhile, Abby, Kane and the survivors of the Ark must face physical and moral dilemmas in their dangerous and beautiful new world. Finally, Jaha makes a heroic decision.
E02: Inclement Weather
A suspicious Clarke confronts President Dante Wallace and demands answers. Kane interrogates one of The 100, and Abby performs emergency surgery. Meanwhile, Octavia resorts to violence to find Lincoln.
When Clarke discovers a horrifying project being carried out in Mount Weather’s medical ward, she joins forces with an unlikely ally. After Abby confesses to committing a crime, Kane issues an order to have her brutally punished. Meanwhile, Monty warns a distracted Jasper that Clarke could be in trouble, and Octavia continues to fight for Lincoln.
E04: Many Happy Returns
After being betrayed by someone she thought she could trust, Clarke takes matters into her own hands and proves she’s not going down without a flight. Bellamy, Finn and Murphy race against time to save a stranger. Meanwhile, tensions rise between Raven and Wick while working together, and an unexpected reunion occurs.
E05: Human Trials
Kane leads a mission to make peace with the Grounders. Meanwhile, Jasper agrees to participate in a risky experiment, Lincoln enters a world of pain and President Dante Wallace issues a warning. Finally, Finn’s search for Clarke takes a violent turn.
E06: Fog of War
Tensions run high between Clarke and Finn, while Raven discovers that Mount Weather is interfering with their communication systems. Meanwhile, Jasper and Monty discover the truth about what’s going on at Mount Weather and Octavia comes face-to-face with her worst nightmare. Finally, President Dante Wallace is about to be betrayed by those closest to him.
E07: Long Into an Abyss
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 returns to Camp Jaha with devastating news. Finn struggles with the aftermath of his actions. Abby gathers information from an unlikely source and prepares for a fight. Meanwhile, flashbacks reveal Finn and Raven’s relationship on the Ark.
E09: Remember Me
Clarke strikes a deal with Lexa and Indra. Abby and Kane begin to realize that decision making powers are out of their hands. A seething Raven is unable to control her emotions. A bold move threatens to destroy the newly formed alliance between the sky people and the Grounders, and a familiar face haunts Clarke. Meanwhile, back at Mount Weather, Monty comes up with a risky plan.
E10: Survival of the Fittest
Lives are at risk as Clarke and Lexa encounter a new enemy. Bellamy and Lincoln agree to work together to break into Mount Weather. Murphy helps Jaha confront his past. Meanwhile, Indra makes Octavia an offer she can’t refuse.
E11: Coup de Grâce
Bellamy and Lincoln’s attempt to sneak into Mount Weather has brutal consequences. Abby fights to stay in control as Clarke steps up in her new leadership role. Meanwhile, with Monty and Harper still missing, a desperate Jasper confronts President Wallace and demands answers.
Tensions between Clarke and Abby come to a head after Clarke crosses the line. Raven helps Bellamy navigate Mount Weather. Jaha and Murphy encounter a stranger who may not be what she seems. Octavia is prepared to fight for someone she loves. Meanwhile, things reach a breaking point at Mount Weather.
Clarke begins to question Lexa’s leadership decisions. Abby struggles to help an injured Kane. 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.
E14: Bodyguard of Lies
While preparing for battle, Clarke and Lexa have a heated discussion. Desperate for help, Raven has Wick summoned to the engineering room. Jaha and Murphy encounter a perilous roadblock. Meanwhile, at Mount Weather, Bellamy is in a race against time.
E15: Blood Must Have Blood (1)
Clarke and Lexa prepare for battle, while Raven and Wick experience a major setback. Meanwhile, Octavia and Lincoln are each forced to make a difficult decision. At Mount Weather, Jasper and Maya witness a horrible act, Bellamy follows through on a promise and Cage goes public with powerful information.
E16: Blood Must Have Blood (2)
The journey to the City of Light continues, and Jaha makes a move that shocks Murphy. Clarke receives help from an unexpected source, a visitor surprises Octavia, and Lincoln gets his revenge. Meanwhile, at Mount Weather, Cage moves forward with his mission and Bellamy and the group struggle to break free.
» Season 3
E01: 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.
E02: 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. Murphy plots to betray his former Chancellor.
E03: Ye Who Enter Here
Clarke wrestles with a decision. Bellamy learns that something isn't what it seems. Murphy plots to betray his former Chancellor.
E04: 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.
Pike's twisted crusade threatens Clarke's attempts for peace. Raven becomes a target. Murphy tries to conspire against Jaha.
E06: Bitter Harvest
Clarke is torn between vengeance and mercy. Kane and Octavia work together to avert a disaster. Abby continues to worry about Raven.
Lexa tries to maintain peace and order within the clans. Clarke uncovers a strange and game-changing truth. A flashback takes us into the darker chapter of humanity’s past.
E08: Terms and Conditions
Kane searches for a peaceful way to handle things but soon realizes he may be forced to resort to drastic measures. Pike suspects that there may be a leak within the walls of Arkadia. Raven has a plan and reaches out to Jasper for help.
E09: Stealing Fire
Clarke discovers a shocking truth. Octavia is forced to make a decision that could have devastating consequences. Kane and Abby share a moment.
Jaha employs a terrifying new method to convince Abby to join his cause, Kane is on a mission. Bellamy is hit with a hard truth. Monty finds himself in a precarious situation. Jasper rushes to save one of his own.
Alie forces Raven’s dark side to come out. Jasper’s anger continues to grow. Octavia wrestles with her place in the world. Monty is forced to make a split-second decision.
Jaha returns to Polis. Murphy has a surprise encounter. Octavia uncovers a clue.
E13: Join or Die
Clarke is on a mission that could change everything. Murphy gains insight that might prove useful in ensuring his survival. Kane reaches a breaking point.
E14: Red Sky at Morning
Clarke, Bellamy, Octavia, and Jasper hit a tragic roadblock. Raven and Monty make an important discovery.
E15: Perverse Instantiation (1)
Clarke finds hope in the most unlikely place. Alie’s master plan comes together.
E16: Perverse Instantiation (2)
Our heroes begin to face the reality of their tragic situation. Everyone prepares for a final showdown.
» Season 4
Clarke and her friends struggle with how to proceed after the fate of the world is revealed.
E02: 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.
E03: The Four Horsemen
Jaha leads Clarke and Bellamy down a road to possible salvation while tensions rise in Arkadia and Polis.
E04: 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.
E05: 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.
E06: We Will Rise
Clarke and Roan must work together in hostile territory in order to deliver an invaluable asset to Abby and her team.
E07: Gimme Shelter
Clarke’s arrival on the island quickly takes a turn for the worse. Meanwhile, Bellamy tries to avoid further tragedy in Arkadia.
E08: 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.
Jasper and Bellamy go on a quest. Meanwhile, Clarke struggles to keep the peace after word of Jaha's discovery spreads.
E10: Die All, Die Merrily
Octavia fights in the final battle for her people's survival, but not everyone is willing to play fair.
E11: The Other Side
Clarke faces the consequences of her fateful choice.
E12: The Chosen
Jaha and Kane disagree over how to handle their grim reality. Meanwhile, Clarke leads a group to save a friend.
It's a race against the end of the world as Praimfaya arrives forcing our heroes to make impossible decisions to ensure their survival.
» Season 5
Clarke struggles to survive on a desolate, scorched earth while her friends in space come across a long-awaited beacon of hope.
E02: 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.
E03: Sleeping Giants
Bellamy leads the charge investigating a potential way home. Meanwhile, Clarke and Madi deal with the new, uncertain threat to their home.
E04: 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.
E05: 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.
E06: 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.
E07: 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.
E08: How We Get to Peace
Clarke’s determination to protect Madi puts Bellamy in an impossible position.
E09: Sic Semper Tyrannis
The growing fractures in Wonkru threaten to explode once and for all. Meanwhile, in Shallow Valley, Murphy starts a fire, unleashing catastrophic results.
E10: 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.
E11: 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.
E12: Damocles (1)
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.
E13: Damocles (2)
In part two of the fifth season finale, 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.
» Season 6
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.
E02: 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.
E03: 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.
E04: The Face Behind the Glass
Clarke embraces the traditions of Sanctum and tries to make amends for her past actions.
E05: 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.
E06: Memento Mori
Diyoza learns more about the mysterious Children of Gabriel while Abby continues searching for a way to save Kane.
Clarke’s past catches up to her.
E08: 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.
E09: What You Take With You
Bellamy must venture into enemy territory with an unlikely companion. Meanwhile, Octavia is forced to confront her past.
Russell seeks justice. Meanwhile, Gabriel must make a difficult choice. Lastly, the Blake siblings reunite.
E11: Ashes to Ashes
Bellamy and Octavia must work together to save their friends. Echo is forced to face her past.
E12: Adjustment Protocol
A special Naming Day changes everything in Sanctum. Gabriel comes face to face with an old friend.
E13: The Blood of Sanctum
Sanctum becomes a battleground between the devout and the non-believers. The mystery of the anomaly deepens.