Aang, trying to help a poverty-stricken Ba Sing Se zookeeper, decided to construct new enclosures for his animals. Aang gathered the mass of animals and herded them in a chaotic stampede through the city toward the Inner Wall. Fluffykins, lured by the sound of Aang's bison whistle, joined the pack sometime during the mad rush, and was accidentally corralled into the same exhibit with the elephant mandrill.
Once inside the zoo, the cat was found by her owner, who energetically pointed at the cat and told her mother, "Mommy! Fluffykins got out of the house again!"