Humanity has abandoned Earth after an environmental disaster. The survivors travel in a gigantic spaceship looking for another planet similar to Earth. They find what appears to be an attractive planet: Monstria. The only problem is it is full of MONSTERS! The captain decides that the humans must remain aboard the ship while it vacuums up all the planet’s resources. But when eleven-year-old Alfa discovers that a monster has made its way aboard the spaceship, and that the monster is actually friendly, she decides to help it get back home. There she discovers the truth about Monstria and all its residents and decides to take action to thwart the captain’s schemes.