Raven and Wick successfully take out the generators at the dam, but they are captured shortly after.

Bellamy works covertly to release Grounder prisoners to fight from within. Key Plot Points

Clarke’s team waits for a one-minute power delay to blow the main lock.

This guide covers the high-stakes penultimate episode of Season 2, "Blood Must Have Blood Pt. 1." Episode Overview Original Air Date: March 4, 2015

As the joint Grounder and Sky People army prepares to storm Mount Weather, survival instincts lead to a betrayal that leaves Clarke and her people isolated. The Battle Plan

Octavia and Indra lead a force through the tunnels.