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 over 2,659, and resources are running out on their dying "Ark" ─ the 12 stations now linked together and repurposed to keep the survivors alive. Draconian measures including capital punishment and population control are the order of the day, as the leaders of the Ark take ruthless steps to ensure their future, including secretly exiling a group of 100 juvenile prisoners to the Earth's surface to test whether it's habitable. For the first time in nearly a century, humans have returned to planet Earth.

The epic second season picks up with the group still scattered and desperate to be reunited. As members of The 100 and new arrivals from the Ark stake out their place in a dangerous and beautiful new world, they are confronted with the physical peril and moral dilemmas that come with reforging society. What kind of life will they build? And what will it cost them? This season's quest will challenge them more than anything that's come before. Hearts will be broken. Lives will be lost. Heroes will be born.

For two seasons, the refugees of The 100 sent to Earth have been at war. First with themselves, then with the Grounders, and finally with Mount Weather. Many have lost their lives along the way. All have lost their innocence. They have learned the hard way that in the fight for survival, there are no heroes and no villains. There is only the living and the dead. But now the war is over. The battle against Mount Weather has been won. The prisoners have returned home to a world seemingly at peace, but can they find peace within themselves after what they had to do to escape? And is there more to life than just surviving? Unfortunately, their newfound sense of normalcy will be short-lived, and their lives will be changed forever, as threats both old and new test their loyalties, push them past their limits, and make them question what it truly means to be human. First, they fought to survive. Then, they fought for their friends. Now, they will fight for the human race.

For three seasons, The 100 have fought to survive. That fight has torn them apart, turned them against each other, and taken the lives of their closest friends.In season three, our heroes found themselves at the epicenters of both the Grounder world and the struggle for Arkadia's soul. Despite their best efforts, all out war appeared unavoidable until a new, even more dangerous threat, one that had been quietly rising all along, exploded to the surface: ALIE, the A.I. that ended the world, offered relief from pain and eternal life in the "City of Light," but as her ranks grew, it quickly became clear that she was building an army dedicated to controlling all sentient life on Earth. This was no longer a battle between warring factions; it was a fight for humanity itself. Now, in the wake of the epic season three finale, a hard truth lands on the shoulders of those who remain. What's left to fight for now? Will they go quietly into the night, or will they find hope and faith in each other, as they face their darkest chapter yet?

For four seasons, The 100 have fought to survive. That fight has torn them apart, turned them against each other, and taken the lives of their closest friends. Season Four introduced our heroes to the harsh truth that the human race is doomed to face an unbeatable enemy: the remaining nuclear reactors on Earth have melted down and are setting the atmosphere on fire. Our heroes had very little time to prepare for the worst, with every possible solution disappearing almost as quickly as they were able to come up with them. With a literal countdown to the end of the world, our heroes will be forced to go to unimaginable lengths to make it out alive – with or without each other. In the aftermath of Praimfaya, they must begin again, and with Season Five our heroes will have to examine their responsibility to the new place they call home, and the future generations who will inhabit it. Can they begin again and celebrate what remains, or will the frailties of human nature cost them their one chance to rise from the ashes?

For five seasons our heroes did whatever it took to survive on Earth...and nothing worked. Earth was unsurvivable, lost to them forever. What was not lost: hope. After 125 years in cryosleep, traveling through the stars, our heroes woke up to a new home, a final gift from some dearly-departed friends. A place where they can try again. They're given one simple task: do better, be the good guys. With this credo in mind, Clarke and Bellamy lead a group down onto this mysterious world, hoping to start anew, to finally find peace. But old habits die hard and when they stumble across an idyllic society, it quickly becomes clear that not everything on Sanctum is as perfect as it seems. Despite their determination to do better, threats both seen and unseen will once again force our heroes to fight for their lives and the future of humanity.

The seventh and final season opens with our heroes picking up the pieces of the society they destroyed on Sanctum. Still reeling from her mother’s death, Clarke, perhaps more than anyone, feels the toll of years upon years of fighting and loss. The group soon finds that maintaining order among the competing factions is no easy feat, and one that has them questioning whether their commitment to doing better was worth the price. At the same time, our heroes must contend with new obstacles on a scale beyond any that they previously experienced as they unravel the mysteries of the Anomaly. What they encounter on this epic journey pushes them to their limits both physically and emotionally, challenging their long-held conceptions of family, love, and sacrifice. Ultimately, our heroes must answer for themselves what it means to truly live, and not just survive.