When Cobra develops the ultimate weapon and uses it to steal a military satellite, G.I. Joe is called into action.

The Joes head to the arctic to get their hands on one of the catalytic elements needed to construct a MASS device to counter Cobra; Duke fights for his life at Cobra Mountain.

Duke recovers from his injuries; Snake Eyes wanders the attic, poisoned by the radioactive crystal elements he recovered from a Cobra trap.

Cobra and G.I. Joe are desperate to get their hands on the final element needed to fuel the M.A.S.S. device.

Destro returns to Cobra Mountain with Scarlett as a prisoner; the Joe team try an all-out assault on Cobra Mountain.

Cobra attacks a G.I. Joe convoy and steals a powerful laser to complete their Weather Dominator.