Invasion (Animorphs #1)

Jake, an average suburban kid, is confronted one night by a creature from space who teaches him how to morph into the forms of other creatures. This fantastic, unpredictable, edge-of-your-seat series can best be described as an "X-Files" for kids--plus a whole lot more! Jake, Rachel, Cassie, Tobias, and Marco are the Animorphs--five kids who can change into any animal they touch. The bottom of each page is animated with "flip-book" images, so as kids flip pages, drawings of each character "morph" into animals.