Rusty is a kittypet who lives near the forest.
One day, he went outside and met his friend, Smudge, who told him about the wild forest cats in the nearby forest, and how "scary" it was. Despite Smudge's warning, Rusty went out into the forest anyway, and was ambushed by Graypaw, a forest cat. Two other cats appeared one was Bluestar, the leader of ThunderClan and Lionheart, a big warrior who was Graypaw's mentor. Bluestar invited Rusty to join her clan the next day. He kept up well, and made it to the Clan's camp. Longtail, a new warrior, challenged Rusty to a fight to prove his worth. Rusty's collar snapped, signifying his ties with twolegs had broken similarly. Rusty won the fight and, in doing so, became a part of ThunderClan.