Old Tom is getting in Angela's way as she tries to tidy the house, so she suggests he goes outside and find a friend. However, outside Old Tom is teased by Billy and, worse, trapped by a savage dog. He is saved at the last moment by a young girl called Lucy. They hit it off immediately, and Lucy invites Old Tom around to her place to play. Unfortunately, they are followed by the savage dog, who bursts into Lucy's house and causes mayhem. Old Tom and Lucy lock the dog in her room and escape, just as her parents come home. They think Old Tom caused all the mess and forbid Lucy from seeing him again - that is, until they accidentally let the dog out. Then Old Tom and Lucy, using one of Angela's vacuum cleaners, manage to get rid of the dog, and teach Billy a lesson.