A message from the past reunites a group of G.I. Joes agents: Dial-Tone, Claymore, Leatherneck and Wet-Suit go back to Brazil to complete a mission that ended badly... one that has plagued them with guilt ever since. Amidst all this, the return of Mainframe? Wait... isn't he dead?! Plus: an all-new story featuring the dynamic duo of G.I. JOE: Shipwreck and Cover Girl?!