In the evil monster movie, an unexpected accident happened at Susan Murphy's wedding.A meteorite fell to Earth hit her, causing the Susan's body to develop into a giant up to 15m high.The army immediately arrested Susan and imprisoned her at a secret research center of the Government.Here, Susan was renamed Ginormica and joined the monster group being studied.At the same time, the mysterious robot was mobilized by Gallahar - the paranoid person who landed on Earth.This robot carries the world's conspiracy to calculate the world and have been bombarded everywhere.In despair, President (Stephen Colbert) only convinced the monster group to join the army to fight the alien invaders, saving the world from the destruction disaster.How will everything go, the monster group joined the army and against the other robot?