Lucy discovers that helping her friend Wendy at judo classes isn't quite as simple as she expects. In fact, Lucy discovers she has a fantastic natural ability and gets picked for the school Judo team. And as Lucy gets drawn into the world of martial arts, Brian discovers that the only way he can keep Lucy as his best buddy is to tag along too. Meanwhile, Sophie decides that she needs a best buddy as well. She studies Mel and Trent's friendship for clues and decides that people seem to like people who are just the same as themselves. So she goes all grungy and buddies up with Trent – much to Mel's disgust.