A group of scientists has discovered the abandoned laboratory of Dr. Schwindel. To their great surprise, they find three young, mutated monsters in the deserted building. The researchers decide to take care of them. The monsters are not yet fully grown and unfortunately have a tendency to venture into the city. Although they have no malicious intentions, their mischievous nature and remarkable powers regularly cause problems and instill fear in the townspeople. The scientists must use all their skills to recapture the monsters in time and prevent the adults from catching them. Fortunately, the scientists have managed to equip each monster with a listening device. This way, they can at least hear where their charges are when they escape from their hiding place.