A mysterious thief is tunneling into banks all over England. How can the spies figure out where he will strike next, when the prime suspect is in an MI-9 prison?

When Oscar's identity as a spy is revealed on the Internet, Rose and Carrie suspect that he is hiding something. But it may not matter, as the Grand Master has sent the infamous Agent X after him.

When students at St. Hope's start turning into Japanese fighting fish, the team suspect that someone is remotely using a mind transfer machine invented by Dr. Wallis, whom they happen to be guarding.

An old enemy of Frank's breaks out of jail and with his gang comes to steal Frank's invention, the Dark Star, a device capable of instantly bringing total darkness to a large area.

The children at St.Hopes are getting fatter and fatter. They are adicted to Wursts. the team must stop the addiction and find out who is behind it all. Jed Black from M.I.9 exercies the kids so they get thin again.

MI9 get a chance to catch the Grand Master, but the team's new gadgets are intercepted. But a dangerous gadget gets in to the hands of Scoop Doggy making him turn in to the New Grand Master.

Rose has been selected for the National Academy of Brilliance! This is an opportunity like no other and naturally she's devastated. It means she has to leave MI High for good! Frank issues Oscar and Carrie with a mission. Dr Vince is a genius inventor. His inventions surpass any that MI9 have and this poses a threat to national security.

Katrina Houseman has arrived at MI High. She has been working on a top secret project: N80, a real life Neanderthal! She needs the spies' help. N80 has been broken out of his cage. Katrina thinks that the Uzhmanis stole him. They plan to take N80 and clone him to create an army of fighting Neanderthals. The possibility doesn't bear thinking about.

The country's power is disappearing at a rapid rate. The best brains in the UK convene to decide a plan of action. Britain's only hope is Raymond Stilt, inventor extraordinaire, and his genius invention: The Glove.

Carrie is set her most difficult mission yet. She has to exploit her friendship with fellow gymnast Lena Larsson to find out about the cruel regime in Boldovia. Lena is from Boldovia and is coming to St Hope's with her team to compete in an international gymnastics competition

The spies put Flopsy up for ransom in exchange for Oscar's Mum. Surely, the Grand Master won't be able to resist and Oscar will finally be reunited with his mum?

A SKUL space probe has landed on the moon. MI9 suspects SKUL are using it to spy on the world. The spies must find out exactly what SKUL are up to and put a stop to it. Oscar goes to talk to astronomer extraordinaire Patrick Houston to see if he knows anything about SKUL's lunar programme.