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 Going undercover, Daisy finds that the PM has been replaced by a cybernetic clone.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

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

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

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.

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

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.

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.

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

At an award ceremony for M.I. 9, the world's greatest illusionist makes the President of the United States disappear - permanently.

A bumbling inventor's Artificial Intelligence unit tries too hard to enforce the school rules.

When a fashion designer's green logo mysteriously begins appearing on kids' skin, Daisy and Rose go undercover to investigate the House of Ferrago as fashion models.

Britain's young people are laid low by a strange sleeping sickness.

The team investigates when their schoolmate Lenny becomes the latest one arrested in a new wave of inexplicable crimes by previously honest kids.

The high school spies become concerned when a Member of Parliament proposes sending misbehaving British children to a remote island.

A new Cold War is in the making, but this time it's the Grandmaster's plan to give everyone the flu.

It's Daisy's worst nightmare when a plague of head lice hits the school, and turns the kids into master criminals.

The high school spies are amazed to discover that they have competition -- there is another team of young people working for MI9.

The world's most famous diamonds are being stolen, and the team suspects the captain of the all-England football team.

A new invisible spy plane is stolen by a mysterious unknown pilot.

Plants rise up and attack anti-green targets, so Blane goes into action.

The government is powerless to stop an asteroid that is hurtling through space toward the Earth. Looks like it's up to our heroes from MI-9 to save the world.

A different boss, Frank London, takes over the helm of the MI-9 team. At first, Rose is mistrustful of the two new spies, Oscar Cole and Carrie Stewart. The new team's first case is the defacing of the world's greatest monuments -- The Eiffel Tower, The Taj Mahal and The Great Wall of China -- with graffiti just before the signing of an important world treaty.

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.

The spies have a vital mission - they must protect a ship carrying the last component required to make a nuclear bomb. Other ships carrying nuclear parts have been raided by pirates and MI9 have intelligence to suggest that this ship will be targeted. The team use Frank's mini-submarine to follow the ship, in an undercover, underwater mission. Meanwhile, Frank is very worried about the team since his cousin Charlton went missing in the same waters some years back and was never found.

The old M.I. High team have graduated and spy handler, Frank London, is on the lookout for a new bunch of intrepid young secret agents to face a global network of evil enemies. Three teenagers who use their unusual talents for dubious purposes are selected. Signing up for spy duties are: super resourceful action man Daniel Morgan, master of disguise Aneisha Jones and tech genius Tom Tupper. In this explosive first episode, the new team embark on their first mission, intercepting the shipment of SKUL's ultimate weapon. The weapon turns out to be a teenage girl called V:9:5:Z:0:E:6 (who later becomes Zoe), but there is an even deadlier enemy waiting in the wings.

Tempers flare and loyalties are tested when a series of embarrassing incidents threaten to bring down M.I.9. The team suspect a resurgent enemy organisation called KORPS of coordinating a sting against them, but having seen KORPS destroyed ten years ago, Frank refuses to believe that they still exist. The team must figure out if there is an enemy agent in their midst or if they are dealing with a foe more cunning than SKUL.

A mysterious fireball crashes in the woods near St. Heart's. Believing it to be a U.F.O., curious students swarm the crash site which turns out to be an enemy satellite with military base information from across Europe. Mr. Grosse, a government agent in charge of the crash site, is revealed to be an impostor working for KORPS. The team must recover the satellite's black box before it falls into enemy hands.

Shunned by the pop world for not having superstar looks, embittered music mogul Cuthbert Peabody hijacks a new M.I.9 invention capable of changing a person's face. He turns popstar Calvin Lame's latest hit single into a weapon to use against the people who he holds responsible for his failure - pop fans. The team must crack an elaborate musical code in order to stop him, but without a musical bone between them, they must turn to an unlikely ally for help - Byron.

The team are given their first international assignment in the rogue state of Boldovia where the local secret service has developed a data mining device capable of destroying M.I.9. On a high octane mission in a foreign land where nothing is what it seems and no one can be trusted, the team must succeed, or risk the destruction of M.I.9.

On a campaign to get kids eating more healthily and concentrate at school, St. Heart's is chosen by celebrity chef Jimmy Jubbly as a test bed for his new health drink - Jubblyade. But Aneisha is quick to discover that it is affecting everyone's behaviour, making them operate with a hive mind.

Out of sync with the times, an old-school spy infiltrates the St. Heart's spybase and hijacks an M.I.9 invention capable of upgrading M.I.9's technology. Once she reverses it, she offers Dan the chance to join the 'old school spies'. With the world's technology being downgraded at an alarming rate, the rest of the team must convince Dan to change his mind, and reverse the damage.

Funded by KORPS, scientific genius Bobby Bleach has brought the country to its knees by releasing a plague of airborne supergerms which have incapacitated everyone who breathes them in. Tom is the only member of the team who escaped infection, and must overcome his fear of being in the field and stop Bleach before it is too late.

Top secret scientific components are being stolen by a thief dressed as a character from a best-selling series of fantasy novels. The team go undercover at a fantasy convention only to discover the threat is far greater than they'd anticipated. Someone is plotting planet-wide destruction in order to make the post-apocalyptic world of the books a reality. Dan must put his faith in the power of imagination to defeat the evil Dark Wizard.

After being haunted by memories of a terrible decision which cost the lives of his entire team in the final battle with KORPS over ten years ago, Frank is sent to a nightmare treatment centre to prevent his sleepwalking from blowing his cover. But KORPS have infiltrated the facility and have been stealing government secrets right from the brains of agents. With the threat of nuclear destruction looming, the team are faced with their most difficult dilemma yet - to save Frank's life, or rescue Britain from catastrophe.

Sent to Uttland on the pretense of being on a school trip, the team must break into the country's deepest, darkest prison to help a former KORPS leader escape. But things go awry when their classmates are falsely imprisoned by fearsome prison warden, Arme Gonnersson. The team must jailbreak their entire class without blowing their cover. Zoe discovers from the former KORPS leader that she may be the daughter of The Mastermind.

Briefed to protect Grand Duke Nicholas, the heir to the throne of a small European state who has had kidnap threats made against him, the team hide him at St. Heart's, where the arrogant prince must learn to behave as a commoner with hilarious consequences. During this episode, Zoe is still shaken by the fact that she may be the daughter of The Mastermind. She uses her DNA and finds she has a sister, B:9:2:K:L:O:E:7 (Kloe) who is later revealed to have tampered genes. She's dangerous, and can't become an M.I.9 agent. Kidnapping the heir and demanding 10 million pounds, Zoe must stop her sister, alone. After the mission is over, Frank tracks Zoe's DNA all around the world, and sees that there are many matches. Too many.

Pieces of the jigsaw puzzle begin to fall into place when the team finally discover the grand scheme KORPS has spent the last ten years building towards. Zoe is kidnapped by KORPS and is revealed to be one of the many clones of The Mastermind. KORPS want to put his consciousness inside her brain, believing that she's the only perfect match. The team must find Zoe, and stop the mind transfer.

It is a new term at St. Heart's and with Zoe still away, spy handler Frank tasks the team with the mission of tracking down one of Zoe's remaining duplicates, Keri, who is the new intended host of The Mastermind's consciousness. It becomes a race against time to reach Keri first and save her from the clutches of KORPS.

Keri's first mission as a fully-fledged M.I.9 agent comes sooner than anyone expected when the team discover an abandoned KORPS base beneath the school playground. Keen to investigate, their efforts are repeatedly hampered by the Saint Heart's centenary celebrations. As a terrible storm closes in, Frank begins acting strangely. When they finally uncover the truth about KORPS' long-forgotten experiments to create monstrous Super-Soldiers, they worry that it is too late to save their beloved boss and prevent the fancy dress disco becoming a Gothic horror nightmare.

The team are sent to investigate Derren Beige, a flamboyant clairvoyant whose previously pathetic predictions have suddenly become scarily accurate. But Derren is kidnapped from right under the agents' noses, leaving M.I.9 boss Stella far from impressed. Suspended from duty, the team must race against time to figure out how Derren uses drawings to predict the future, then rescue him before his new-found powers fall into the hands of his dangerous captives.

When government food advisor George Monoblot is sacked after highlighting the dangers of a revolutionary sugar substitute, Cupodium, he seeks retribution and unleashes a virulent form of the substance into the food chain. The team must find the antidote and stop Monoblot before the school and whole country is affected and subsequently destroyed by the final stage of the compound - Rage.

During a successful M.I.9 mission to secure the deadly assassin Samantha Stiletto, KORPS mistakes Keri for the assassin. Keri takes Stiletto's place in the world's most deadly tournament, The Shadow Games, where the winner will become the new Shadow Master of SKAPULA, KORPS' assassination division. The team's only chance of rescuing her is to rely on ex-Shadow Master, Alexis von Hades, who is far from trustworthy.

After learning that KORPS have a weapon of mass destruction, the team travels back to the 1940s to learn about the origins of the 'WMD' and the true history of M.I.High.

Tom discovers the online Dark Wizard avatar from Blade Quest has become self-aware.

Dan joins a free running group that has been accused of committing crimes. Stella goes undercover on a teaching job for Saint Hearts.

Frank is asked to join a secret order within M.I.9 called the League of Mata Hari. However, the curious team uncovers a criminal conspiracy that runs throughout M.I.9.

M.I.9 have acquired a fragmented message from the terror organisation 99p. They are a group that is dedicated to bringing down the world's economy to 99p. The message reveals that the group is going to attack the M.I.9 Communication Centre and Dan, Aneisha and Keri go to investigate but are attacked by the group. After managing to escape, the team question how 99p managed to find the centre. An external breach is to blame, leading the team to believe that Scraper Associates are at fault, being the only non-M.I.9 personnel to have access to facilities. Meanwhile at St Hearts, after having many billboards installed, by the same Scraper Associates, Mr Flatley and the students try to come up with an advert to promote their school.

Mandy Pluckley, the country's top 'agony aunt', has been abducted by KORPS. She is the sworn confidant of the Prime Minister and he is dependent on her. Without her guidance, he has started to lose his mind and sense of reality. Making matters worse, in three hours, the British Government is holding the Unity Summit which puts every country's defences under a single system. His only permitted aide is Mandy and the team need to find her so that the PM can complete his duties at the Summit. After barely competing their mission, the PM sees their close call as a danger and orders them to be stood down, permanently. Meanwhile at St Heart's, Mrs King is shocked when she receives a letter informing her that a student has complained to the Education Minister about her. She vows to find the culprit no matter what.

The MI High team have set up their own agency after being fired from M.I.9. After many unsatisfying missions and almost quitting the job completely, they get the call they've been waiting for. Edward Lambsbottom, a senior technician at GDHQ (the government's secret listening station), has intercepted a conversation with the Crime Minister. She was discussing KORTEX and that KORPS are planning to assassinate the Deputy Prime Minister. He tried getting this information to M.I.9 but saw his new boss, Martin Strong, destroying evidence. The MI High team take this information to Frank, who still has a job at M.I.9, to try and figure out what's going on.

The team, Frank, and Stella have gone into hiding as M.I.9 has been taken over by KORPS. As KORPS' plans are nearing completion, the team must act fast. Frank tells them about 'The Heart', a rumoured super computer that controls all of KORPS' networks. They plan to destroy it but the only problem is that it is located at KORPS Central HQ which has never been found. Tom comes up with an idea and the group break back into their base under St. Heart's. Tom reveals that he made a gadget that contains a microchip that holds an anti-virus before they were fired, it will make Keri reject The Mastermind's consciousness if KORPS try to transfer it. It also contains a tracking device, so if Keri gives herself up, KORPS will take her to their HQ, leading to The Heart. Keri accepts, but the team also have far more pressing matters to worry about. Meanwhile, Evelyn Baxter is bent on taking over the country, and then destroying it.