It's Adopt-A-Thought Saturday, an event that focuses on getting good friends adopted on the weekends when children are out of school. But Mac and Bloo find out after their good friend Jokey gets adopted. While the event is usually a good thing for both imaginary friends and those seeking to adopt them, Bloo doesn't want his friends to be adopted, so he works with Mac to try to find a way to put an end to the event. From atracting friends in the house with scented cupcakes to dropping plastic spiders, they try as many plans as they can. Will they be successful in prevent the adoption of their friends, or are their best efforts in vain?