Four adopted brothers come back home to avenge their mother's death at what appeared to be a random killing in a grocery store robbery. However, the boy's investigation of the death reveals more nefarious activities involving the one brother's business dealings with a notorious local gangster. Two local cops, who are trying to solve the case, may also not be what they seem.

Cobra ambushes the special forces units of Duke and Ripcord and Duke decides to join the G.I. Joes in an attempt to bring down Cobra and stop a nuclear attack.