The 100 hurtles toward the end of its freshman season, setting the stage for a finale that will leave fans talking for months. On the first part of "We Are Grounders," there are two important events taking place. One being the fight for survival on the ground, and one being the fight in space. For the most part, the two entities have been separate. With the exception of a small window of communication, made possible by the late arrival of engineering prodigy Raven (Lindsey Morgan), there has been minimal interaction between the ground and their former home, the Ark. Clearly that is about to change.