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After a nuclear apocalypse that wiped out the human race, a few hundred survivors managed to survive in space on The Ark. 97 years later, the 100 prisoners are sent to Earth in a desperate mission to see if it is survivable again due to the fact that life support (oxygen) on the Ark is running out. Some of the prisoners include the Chancellor's son, Wells, Bellamy who snuck onto the dropship to be with his sister Octavia, best friends Jasper and Monty, Finn, and the daughter of two council members, Clarke Griffin. They are all forced to make difficult choices and are faced with many obstacles.