Finn was a major character in the first and second seasons. He was portrayed by starring cast member Thomas McDonell and debuted in the series premiere. Finn was a tracker for the 100. He was killed in episode eight of Season Two, Spacewalker. Finn was part of the original 100, arrested for an illegal spacewalk that cost The Ark roughly 3 month's supply of oxygen. He was covering for Raven who was 18 at the time and would have been floated for the crime. He survived the battle with the Grounders but was captured by Tristan. After being rescued, Finn was taken to Camp Jaha by Marcus Kane.