Sarge Hawk and Colonel Grimm narrowly escaped by helicopter from the Tan attack on their Green base, but on the way they spot a Blue tank in the middle of the nearest town, which is very suspicious given the circumstances, and Hawk He decides to go and investigate. Trying to follow the Spy, Sarge enters some kind of strange, illuminated cave or hole, which leads him to what appears to be another world totally different from his own: a vast and gigantic world. But to the misfortune of the Blue spy, the place where they ended up is too small to escape, and Hawk captures him back for debriefing.
The Spy provided a lot of information about the plans of Plastro and the Tan army, about the discovery of the "Portals" and the weapons that Plastro can get from there. Also the whereabouts of the Heroes.
Having rescued Hoover, Riff, Thick, and Shrap, Sarge is informed by Colonel Grimm that Plastro has sent an ultimatum to the Green nation: "Surrender or be destroyed." The Greens' only option is f