When I was little, I really liked a book called animorphs by K.A. Applegate. This book tells the story of a group of teenagers who return from a mall through an abandoned building. There they encounter aliens with human bodies and horse legs named Andalites. Andalite prince himself said that the earth is in danger because the Yeerks want to take over the earth. So this Andalite prince gave that five teenagers the power to turn into animals. This is where their adventure begins.
