Susan Murphy, transformed into a giant monster after being struck by a meteorite, is enlisted by the government to join with other monsters to save San Francisco and the world from invading aliens.
Charles "Chuck" Baker, an American astronaut, lands on Planet 51 only to discover a race of green people who live in fear that aliens--like Chuck--will invade their peaceful planet.
Easy-to-follow text and colorful illustrations introduces early readers to the members of Team Monster, which includes The Missing Link, Insectosaurus, B.O.B., Ginormica, and others.