The Gardaí say there's a thief at work in the area. Daidí and Mamaí want to get rid of Lúlú, and buy a guard-dog instead. But Jeaic has a better plan. He is going to build a robot that will catch the thief. But Mamaí and Daidí aren't too sure about that!
Lúlú is in trouble. There's a great big cross rotvelller in the house next door, and Lúlú is scared stiff of him. But Jeaic thinks he can solve the problem. If he mixes the right chemicals he can make a special potion for Lulú - and make her grow enormously big!
Jeaic has created a new chemical potion. It can make you invisible! Jeaic give Lúlú the potion and Lulu can slip into the house without being seen. But when poor Mamaí trips over Jeaic she thinks there is a ghost in the house. Poor Mamaí is frightened out of her wits.
