Gareth is a main character, an antagonist and a survivor of the outbreak, first encountered in the Season 4 finale of AMC's The Walking Dead. He is the leader of the cannibalistic compound Terminus and serves as the secondary antagonist of the second half of Season 4, and as one of the two primary antagonists of the first half of Season 5, the other being Dawn Lerner. More specifically, he is the primary antagonist of the first quarter of Season 5. He is portrayed by Andrew J. West.