WILLOW, CHOWSER and SYD have the important task to train ZAK so he can survive all the dangers of the yard, before they can go on their first hunt, for the lost Shrinkinator's parts. But they are not the only one, who want to re-build the machine in order to become big. Adilla, the evil mosquito queen and her cockroach henchmen have plans on their own for the Shrinkinator. The team finds one of the parts and its on their way back to the shed, when they meet the roaches, who are send by Adilla. Instead of standing up against the roaches, the Insectibles quickly run, to escape from the danger. It will be up to Zak, to show his new friends, that they can work together as a team in order to defeat the roaches and bring back the part.