Knowledgebase
The Season 1 finale of The 100 , originally aired on June 11, 2014, and serves as a high-stakes turning point that permanently shifts the show's landscape . Key Plot Developments
On the Ark, Chancellor Jaha makes a heroic sacrifice, staying behind to manually trigger the separation of the stations . This allows the remaining residents of the Ark to return to Earth, though Jaha is left alone with a limited oxygen supply .
The battle results in significant losses, including 28 delinquents . Following the rocket blast, the fates of Bellamy and Finn are left unknown, while Octavia is led away by Lincoln after being shot with an arrow . The Mount Weather Twist
The conflict between the 100 and the Grounders reaches a brutal climax . Facing an imminent attack, the Delinquents use the remaining rocket fuel from the dropship to incinerate the Grounder army, killing approximately 300 Trikru warriors .