The girl (Boo) escapes and is seen, causing mass panic and alerting the Child Detection Agency (CDA). The two grab her and barely make it home. The girl stays overnight and is soon named Boo (for her habit of saying “Boo!” all the time). The two come to know she is not dangerous as once thought, but they still plan to return her home the next day. She is disguised as a monster and they sneak her inside Monsters, Inc. When she first appears, Boo is very attached to Sulley (calling him “Kitty”), but he is not so keen. But as the film progresses, he develops a bond with her. At one point, Sulley, under Mr. Waternoose’s orders, roars in front of a child used for simulation, not noticing that he has also scared Boo. Sulley tries to apologize to Boo, but she is too terrified of him and runs to cower underneath Mr. Waternoose’s legs. Waternoose, who has caught sight of Boo, decides to take care of her before anything worse happens.