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.

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.

After a shocking death, Clarke and Finn grow closer. Bellamy must keep the group from turning on one another and Abby takes a huge risk.

After exposing Kane’s plan to reduce the population of the Ark, Abby and Jaha realize at least some of the 100 must still be alive.

Bellamy and his crew run into Grounder territory as they search for Octavia while Raven notices the deep connection between Finn and Clarke.

The 100 S01E07 is about how Abby guides Clarke through a dangerous procedure while Diana Sydney takes her place as Chancellor. Kane agonizes over his recent decision.