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.

A suspicious Clarke confronts President Dante Wallace and demands answers. Kane interrogates one of the 100, and Abby performs emergency surgery.

Clarke and Finn attempt to broker peace with the Grounders while others prepare for battle. Meanwhile, tragedy strikes the Unity Day celebration.

Clarke and Finn lead a hunt for food, Raven makes Bellamy an offer he can’t refuse, and Kane risks his life and reunites with Jaha and Abby.

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.

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.