“Resurrection” is episode thirteen of season two of The 100.
Despite knowing about the missile fired from Mount Weather at Ton DC in the previous episode, “Rubicon”, Lexa convinced Clarke not to warn anyone. The missile caused a lot of damage and death (although possibly not as much as was expected – the last one fired was described as leaving a crater too big to see across, and this one didn’t; perhaps they have different sizes of missiles). The spotter is shooting the survivors as they try to rescue the injured, so Lexa and Clarke go after him.
In Mount Weather, Jasper and the others are barricading themselves from the rest of Mount Weather. The not-very-nice Dr. Tsing has died from radiation poisoning – it really affects Mount Weather inhabitants oddly, in fact incredibly, quickly. Much quicker than it should really, probably not even if the radiation levels were unbelievably high. It appears that not everyone inside the facility agrees with what’s going on.