When a meteor strike turns Susan Murphy into a giant monster called Ginormica, the evil alien Gallaxhar tries to destroy her and take over the Earth, but Ginormica and her monster friends battle to stop him and win their freedom.
When an alien robot crashes into Earth and creates a wave of chaos, the U.S. government unleashes an unusual weapon—monsters! Otherwise known as Ginormica, The Missing Link, Dr. Cockroach, Insectosaurus, and B.O.B., the monsters have a chance to win their freedom by saving the world. But the robot is just the beginning. Can the gang stop an alien invasion before the Earth is destroyed?