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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.

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

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.

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.

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 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.

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.

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

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.

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.

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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.

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.

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.

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?

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

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

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.

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.

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.

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.