Ageing beautician Vanessa Zeitgeist poisons scientists with a formula to turn them into toddlers. The whole school except the spies and Lenny are acting like 3-year-olds, and with Rose's dad coming to look around the school she might have to leave!

When what appears to be a flying saucer from Outer Space crash-lands in the local park, the spies ignore orders from Lenny stating that Air One have priority over MI9 in the case. Led by one of Lenny's best spies, Carla Terrini, Air One is determined to capture the pilot of the strange craft. But has the pilot really come from another world, and is he friend or foe?