A mad inventor and his modified animals are determined to sniff out the school spies.
When a charismatic teen CIA officer joins the spy team, Blane's jealousy drives him to take a crazy risk.
Expert hacker The Worm has taken control of Britain's space defenses and left the country vulnerable to attack.
When freak power cuts sweep the nation, the teenage spies are in the dark about who or what is to blame.
MI9 suspects that the boy band "Crush" is hypnotising fans with the lyrics in their songs.
A secret plan threatens to plunge the world into a new ice age via a machine that can control the weather.