One hundred young exiles from a dying space station are sent to Earth 97 years after a nuclear apocalypse to test if the planet is now inhabitable.

Having discovered that Jasper may still be alive, Clarke, Bellamy, Octavia, Finn and Monty set out on a mission to locate their friend.

After a betrayal, Clarke takes matters into her own hands, Bellamy, Finn and Murphy race to save a stranger and tensions rise between Raven and Wick.

In The 100 S01E08, Some of the 100 lose touch with reality after eating a hallucinogen. One of them is tasked to kill, and Diana Sydney’s treachery is revealed.

In The 100 S01E03, A fast-moving, toxic fog jeopardizes a mission to find a substance that could save Jasper’s life. Clarke learns the truth about her father’s betrayal.

Clarke teams with an unlikely ally after making a horrific discovery about Mount Weather’s medical ward. Abby confesses to a crime.

Trapped in the white room, Clarke tries to make sense of her surroundings. The Ark survivors face moral and physical dilemmas. An old enemy returns.