“Fog of War” is episode six of season two of The 100.
Clarke doesn’t know what to think of Finn, after finding him gunning down Lincoln’s village at the end of the previous episode, “Human Trials”, when his belief that the Grounders had Clarke and the rest was sending him past the edge of reason.
Clarke convinces her mother to investigate Mount Weather, and they head there with a team. Octavia and Bellamy try to find a way into the mountain, and we find out a bit more about what was being done to Lincoln. Inside the mountain, Jasper and Monty find out more about what Mount Weather is doing.
It also turns out Mount Weather had crashed the dropship that had been pirated by Sydney in “Unity Day”, something I had guessed after seeing Monty in Mount Weather in a room opposite Clarke’s at the end of “We Are Grounders: Part 2”.