The next day, Jake morphs into a green anole lizard to spy on Chapman, and discovers that there is an entrance to the Yeerk Pool—a large, underground control center where the Yeerks can feed and recuperate—in their school. The teenagers, newly christened as Animorphs ("animal morphers") by Marco, head to The Gardens, a large zoo and amusement park, to acquire some new, battle-capable morphs. That evening, they decide to infiltrate the Yeerk Pool in order to rescue Tom, but find that Cassie has been kidnapped by the policeman-Controller. With no time to plan a strategy, the four remaining Animorphs head into the Yeerk Pool. They manage to rescue Cassie, but find themselves outnumbered and outgunned by Visser Three and his Yeerks. Jake, Rachel, Marco, and Cassie barely escape along with a woman who is free. During the escape, the policeman-Controller is killed. Tobias is able to escape later, but has stayed in morph too long and gets stuck in morph as a red-tailed hawk. The Animorphs fail to rescue Tom, and Jake promises to keep fighting the Yeerks until the Andalites arrive.