An earthquake in the Salton Sea unleashes a horde of prehistoric mollusk monsters. Discovering the creatures, a Naval officer and several scientists attempt to stop the monsters, but they escape into the canal system of the California's Imperial Valley and terrorize the populace.

The story revolves around Xia Tian, a single mother and an associate researcher whose life's work is a machine that can allow people to return to the past. However, upon the completion of the machine, her son, Dou Dou, gets kidnapped and is held ransom in exchange for it. The only way she can save her son is by using the machine to travel an hour and fifty minutes back in time to prevent the kidnapping.

A bacteriological weapon developed by the US Government to create a super soldier - spreads an epidemic in a quiet little town in the middle of Eastern Europe. All citizens have been turned into infected zombies. The plan is to bring an atomic bomb into the city's nuclear plant to pretend a terrible accident occurred. No one has to know the truth. A team of mercenaries is hired to complete the mission. The battle is on. Hordes of monsters against the team. WHO WILL SURVIVE?

Forty-two years after her first visit in Tokyo, Mothra returns to warn mankind that they must return Mechagodzilla, along with Godzilla's bones, to the sea, for the dead must not be disturbed. If not, dire consequences will follow. However, Godzilla is once again on the rampage, and Mechagodzilla is Japan's only defense.