Young teenagers Jake and Marco leave the mall one evening. On the way out, they meet Rachel and Cassie, who are together, and Tobias—all children from their school—and decide to walk home together. While taking a shortcut through an abandoned construction site, an alien spacecraft lands nearby. The badly injured alien pilot, an Andalite named Prince Elfangor, emerges from the ship and explains to the children that the Earth is being invaded in secret by a race of aliens called the Yeerks, a slug-like parasitic species who infest humans through their ear canals and take complete control of the human's body, turning them into what is called a Controller. The human controllers are still self-aware but the Yeerk in their head has complete control over their body and what they say. Elfangor tells them that the Andalite fleet has been defeated and more Andalites will not come to Earth for a year or more, and by then, Earth will already be completely taken over. To combat the Yeerks, he gives the humans morphing ability: the power to become any creature they touch by absorbing the creature's DNA. Elfangor warns them to never stay beyond two hours in a morph, or they will be trapped in that form forever. The Yeerks, led by Visser Three, arrive to kill Elfangor and eliminate all traces of him and his ship. The humans hide and watch, but are discovered and chased by the Yeerks. The group escapes shaken, but more or less unhurt.