When a teen working for the CIA joins the team, Blane's jealousy causes him to take a crazy risk.

When zombies start ransacking music stores, MI9 suspects that a boy band named Crush is responsible, so Daisy again goes undercover to investigate.

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 Going undercover, Daisy finds that the PM has been replaced by a cybernetic clone.

The Grand Master, leader of the Secret Kriminal Underground League (S.K.U.L.) threatens to freeze the world unless everyone submits to his rule.

Everyone is in the dark as freak power outages sweep Britain.

A wannabe SKUL member, after overhearing an MI9 meeting, thinks that St. Hope's teachers are the agents and sends in bugged animals to spy on them. Okay, nothing much to worry about... until a truth serum dart accidentally hits Daisy.

When a hacker called The Worm takes control of Britain's space defence system and leaves the country vulnerable to attack, Stewart must employ his computer skills to the max.

The teen spies defy their superiors to help an extraterrestrial fugitive.

A former beautician's youth potion ends up turning the school's teens into toddlers.

When a teen scientist invents a method of disarming missiles that could make the army obsolete, he is kidnapped by a war-mongering general.