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?

Rich-kid millionaire Dylan Towser invents the Missile Disarmer, a device which neutralises attacking missiles and will thus create world peace. But his Security Chief, General Ryan Scarp, believes that the Army will become redundant as a result, and makes insane plans to start a Third World War.

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!

In a bid to apply for membership of SKUL, inventor Silas Fenton sends animals to spy on the teachers (who he thinks are the spies), but a truth serum dart hits Daisy. Oh no! What will she reveal?

Daisy falls for teenage CIA officer Chad Turner. Blane puts on one of the MT 3000, that Chad has brought for Rose to fix, because he is jealous of his popularity. Or is it something else?

A shuttle launch is about to be sabotaged, unless Stewart can defeat a computer geek named The Worm.

A madman named Brent Gilbert is planning to start the new Dark Age by using the three dark stones - unless the Government gives him £250,000.

A pop band, Crush, is hypnotising fans with the lyrics in their songs.

Can the MI High spies foil a secret plan to plunge the world into a new ice age via a machine that can control the weather?

The young spies are called upon to investigate when they hear that the normally peace-loving Prime Minister is on the verge of declaring World War III. Going undercover, Daisy finds that the PM has been replaced by a cybernetic clone.