As the world slowly recovers from the recent Demonic Apocalypse, a new threat is emerging. Or at least, one that has lain dormant for centuries. Guided by the mysterious Man in Black, what remains of the Martian Empire has long planned to "awaken" war tripods hidden beneath the Earth's surface in various strategic locations in order to seize control of the Blue Planet. The members of the Monster Squad, while paying tribute to Quasimodo and Leroy—the latter having sacrificed himself against the demons—will become aware of this threat and, once again, add their two cents to the mix. They can mitigate the damage, as this Machiavellian plot seems to have its base in Mother Russia, which the monsters must protect. But once again, things are unlikely to be resolved without bloodshed...