While battling COBRA, the Joes gets two visitors: The Oktober Guard (the Russian version of G.I. Joe), and aliens. Now the Joes and The Oktober Guard must join forces to find out who the aliens are, and what their purpose here on Earth is.
When a suspected invasion from outer space threatens the planet, the Joes are forced to team up with their Russian counterparts, the Oktober Guard. But as the two teams struggle to contain the threat, they discover more than they bargained for.