"آزمایشی"

‫۹۷ سال پیش، هسته آرماگدون سیاره زمین را نابود ساخت و تمدن ها را از بین برد. تنها بازماندگان ‫۴۰۰ نفر از ‫۱۲ ایستگاه فضایی بین‌المللی بودند که هم زمان در مدار می‌چرخید. سه نسل در فضا زاد ولد نمودند. اکنون تعداد بازماندگان ‫۴٬۰۰۰ نفر است، و منابع در "آرک" در حال مرگ رو به پایان است. بین ۱۰۰ تبعیدی کلارک، دختر جوان روشن فکر، فین کله خر; خواهر و برادر بلامی و اوکتیویا، که به دلیل شرایط نا‌به‌سامان مجبور به قانون شکی شدند، جاسپر روشن‌ دل و مانتی، نابغه گروه حضور دارند. تکنولوژی چشم آن‌ها را به روی حقایق زمین بسته است، رهبران آرک مادر بیوه کلارک، اَبی صدراعظم جاها، و سایه او فرمانده کین -- با تصمیمات سختی برای زندگی، مرگ و ادامه نسل انسان هستند.‪‏‏

Discovering that Jasper may still be alive, Clarke, Bellamy, Finn, Wells and Murphy head out to find him. On the Ark, Abby is determined to prove Earth is habitable, and enlists a mechanic to craft an escape pod.

As a dangerous, acidic fog approaches, Clarke, Finn and Wells set out in search of a seaweed-like plant to make an antibiotic poultice for Jasper's wounds, while a vulnerable young girl follows when Bellamy takes a group out hunting for food.

A plan to contact the Ark is put in motion after Raven crash lands on Earth. Meanwhile, Abby exposes Kane's plan to reduce the population of the Ark.

Bellamy, Finn and Jasper head into Grounder territory to search for Octavia, as flashbacks show the siblings' difficult childhood on the Ark. Meanwhile, Raven finds out about Clarke and Finn.

While Bellamy tortures the Grounder, Raven and Clarke make contact with the Ark and ask Abby to help them save Finn. On the Ark, Kane deals with his guilt, and Jaha surprises the council with a shocking revelation.

Shumway secretly orders one of the 100 to kill Bellamy. Meanwhile, hallucinogenic nuts provide Octavia with an opportunity to help the Grounder escape the camp, and Bellamy and Clarke investigate a nearby underground depot, where they find military weapons.

Finn arranges a meeting with Clarke and the leader of the Grounders in order to bring peace, however a sceptical Clarke warns Bellamy, who along with Jasper and Raven follow them to the meeting with weapons. On the Ark, Diana takes over the exodus ship.

Murphy returns to the camp carrying a horrific virus created by the Grounders to weaken the camp. After learning the Grounders plan to attack the next day, Bellamy, Finn and Raven come up with a plan to delay them.

Clarke and Finn are captured by Anya, who forces them to save the life of a victim of the explosion. Meanwhile, Raven deals with her split from Finn, and Kane fights to save the Ark and it's survivors.

Clarke and Finn come face to face with a new enemy after Lincoln rescues them from Anya, while Bellamy, Raven, Octavia and Jasper deal with a vengeful Murphy. On the Ark, Jaha makes a plan to try and get to Earth.

As the remaining members of the 100 face off against the Grounders, Jaha makes a noble sacrifice to ensure the Ark makes it to Earth.