Season 2, Episode 15
Blood Must Have Blood Part 1
Bellamy is letting the grounders inside Mount Weather out of their cages as Cage starts to raid the complex for the 47. Some of them are temporarily captured but freed again by Bellamy, Jasper and Maya who bring them to the harvest chamber. Soldiers soon raid the harvest chamber too, taking the 47 prisoner once again. Meanwhile, Cage visits his father, desperately hoping he will tell him a way to stop the incoming attack. Raven and Wick destroy the mountain's generators and the lock on Mount Weather's door is disabled. When they pull the door open however, Lexa commands her people to stand down she has made a deal with Emerson, her people freed if the grounder army retreats. It is later learned that this was Dante's suggestion. When the grounders retreat, almost all sky people accept defeat and soon leave too, leaving behind only Clarke at the front door and Octavia in the tunnels.
- Friend or Idol Decision: Mount Weather offers to release the Grounder prisoners in return for abandoning the Sky People. Lexa chooses to accept it considering it her duty, despite caring deeply for Clarke.
- Love-Interest Traitor: Despite her love for Clarke, Lexa agrees to the deal with Mount Weather.