The Celestian Alliance was at Foster's Home for Imaginary Friends, unpacking for school was coming soon. Betty Ann said, "Only 2 weeks til School starts." Then Billy Cranston barges in. " "Billy." said the kids. Billy said, "After our friend, "Kat Hillard" joined the team, I got a job here at Foster's Home for Imaginary Friends, plus i'll be attending an online college from there." A voice said, "Step right up and come down to Foster's Home for Imaginary Friends." they followed the voice, while Tucker goes into the attic. Outside, They saw an experiment who looks like a salesman. Lilo said, "Experiment 020 a.k.a Slick. He can sell things." Slick said, "A place to adopt one of a kind friends. Choose from Dancing Giraffe to Bubble Cat." There Stitch said, "Cousin."
They went inside and everone found out that Tucker filled the pipe system with lemonade. Jackie Khones explained that he saw Tucker filing the pipe system through Plumper Paul whom forced him to fill it, while he goes into the attic. The Celestian Alliance, Bloo, Wilt, Mac, Coco, Eduardo, and Billy went into the attic to find the toy chest. Billy said, "That's chest has been here for weeks and Mr. Herriman said not to open it." Though they should so they can find and save Tucker. Betty Ann said, "Someone should stay here in case comes." Gary said, "Iago, Donkey, and Puss, you three stay here and keep an eye out for Mr. Herriman." Puss said, "We'll keep him away from the chest while you look for your brother." Iago said, "If you don't come back, we'll keep your stuff."
They went inside the box and discovered a world where toys are alive, trees are cardboard, grass is carpet and candy grows on bushes. Applejack then found a tree with writing on it that said, "Frank is a big mouth." Frank shouted, "Say What? Me a big mouth?" Gary knew that his own brother would say something that awful. There they headed off to find Tucker.