“Blood Must Have Blood: Part 1” is episode fifteen of season two of The 100.
The final assault on Mount Weather is happening. Raven and Wick are heading to the dam that provides the facility’s electrical power to knock it out. Once done, the front door will be blown and they can attack. Octavia and Indra are heading in through the Reaper tunnels.
With the destruction of the veil (the acid fog) in the previous episode, “Bodyguard of Lies”, Mount Weather has no defences left. Cage, out of desperation, turns to his father for help, but also sends his forces looking for the escaped members of the 48, and they are killing those members of Mount Weather who have been found to help them.
An unexpected end as Lexa does something that’s possibly very stupid. The story continues in “Part 2”.