How did a brilliant scientist go from being a devoted husband and father to becoming the worst despot the universe has ever known? In issue #4, you witnessed Zarkon pushed to the edge of sanity by crushing loss and absolute failure---now, learn how a quest for revenge took everything else from him, leading down a dark path that claimed countless lives and terrorized the galaxy for decades. One of his many victims demands answers, but will anything he hears change his mind about the fateful decision made well before he put the gun to Zarkon's head? Two stories of pain and retribution collide in 'Devil You Know', as the first arc of Generation Voltron comes to an impossible end...