High-school kids, enrolled in spy agency training, go on secret missions assigned by their janitor.
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 Going undercover, Daisy finds that the PM has been replaced by a cybernetic clone.
Can the MI High spies foil a secret plan to plunge the world into a new ice age via a machine that can control the weather?
A pop band, Crush, is hypnotising fans with the lyrics in their songs.
A madman named Brent Gilbert is planning to start the new Dark Age by using the three dark stones - unless the Government gives him £250,000.
A shuttle launch is about to be sabotaged, unless Stewart can defeat a computer geek named The Worm.
Daisy falls for teenage CIA officer Chad Turner. Blane puts on one of the MT 3000, that Chad has brought for Rose to fix, because he is jealous of his popularity. Or is it something else?
In a bid to apply for membership of SKUL, inventor Silas Fenton sends animals to spy on the teachers (who he thinks are the spies), but a truth serum dart hits Daisy. Oh no! What will she reveal?
Ageing beautician Vanessa Zeitgeist poisons scientists with a formula to turn them into toddlers. The whole school except the spies and Lenny are acting like 3-year-olds, and with Rose's dad coming to look around the school she might have to leave!
Rich-kid millionaire Dylan Towser invents the Missile Disarmer, a device which neutralises attacking missiles and will thus create world peace. But his Security Chief, General Ryan Scarp, believes that the Army will become redundant as a result, and makes insane plans to start a Third World War.
When what appears to be a flying saucer from Outer Space crash-lands in the local park, the spies ignore orders from Lenny stating that Air One have priority over MI9 in the case. Led by one of Lenny's best spies, Carla Terrini, Air One is determined to capture the pilot of the strange craft. But has the pilot really come from another world, and is he friend or foe?
Daisy, Blane and Rose return to St Hope's for a new term. After a thrilling chase, they catch Britain's most deadly threat, the Grandmaster, and are the toast of the secret services. But, while accepting an award at MI9, they witness the mysterious disappearance of the new American President during a magician's act.
MI9's Head of Technology, Quentin Flake, is at St Hope's to test new crime-busting computer Allen, who uses normal electrical devices to keep order. The redundant spies are totally put out that they have no work to do - aren't they the security service? But when a vacuum locks up 50p for littering, the team realises that Allen is a tyrant intent on taking over the school.
Britain's kids are going crazy for the fashion designs of Lorenzo Ferrago, but when green logos start appearing on children's skin, the school spies take to the catwalk to investigate the designer. They decide to infiltrate the House of Ferrago by posing as models. Once inside, the team discovers Ferrago is in cahoots with the Grandmaster.
School spy Blane is not impressed when Olympic hero Maximus Fiticus is invited to St Hope's sports day. Daisy joins in with the rest of the school when Maximus offers them the chance to use his special Powerlyser machine - she believes his machine really can make her look better. But, Blane realises the Powerlyser is actually stealing the kids' energy.
A child crime wave hits MI High. The teen spies have to discover why the crimes are being committed by supposedly well-behaved kids, and are baffled when Lenny has also seemingly turned to a life of crime.
MI High is in danger of being exposed when cameras go up around the school as part of a good-manners initiative. But, when footage of the pupils' terrible behaviour is edited and leaked to the media, it seems someone wants to make St Hope's look worse than usual. The spies realise the Minister for Schools is guilty of altering the footage because she hates kids.
The Grandmaster unleashes his own cold war on Britain, a nasty flu epidemic.
St Hope's is on red alert - nits are sweeping the country! But when they infest the school and the pupils take on the characteristics of criminals, the teen spies realise these are no ordinary nits. The chief suspect is nit nurse Nora Braithwaite. Daisy realises the only way to stop the infestation is to destroy the gross mother nit on Nora's head.
The team is shocked when they meet new undercover school spies and reformed criminals The Worm, Lewis Chuckworth and Violet, who have been retrained by MI9. But Rose decides they can't be trusted and her fears are confirmed when St Hope's is invaded by ninjas.
An audacious diamond thief is on the loose, and Her Majesty The Queen entrusts her Crown Jewels to MI High for safekeeping. Chief suspect is Ben Wheeler, England Captain and former diamond collector. Rose and Blane suspect that Wheeler is using his 'Sling Your Bling' campaign as a front for the thefts, and divert him to St Hope's for further investigation.
The MI High team is flown in to investigate the mysterious disappearance of a high-tech spy plane, which uses a cloaking device to become invisible. Embarrassed inventor Boris Ryfield is desperate for the plane to be found, so Blane goes undercover as a plane-collecting oil baron to track down the thief.
Plants across Britain have gained minds of their own and started cocooning builders and developers. When the spies suspect that Greenfinger, the evil villain behind the green invasion, is hiding out in a wood, Daisy cleverly persuades Mr Flatley to take them there on a school outing. But Flatley decides it's a boy's adventure and Blane must investigate alone.
An asteroid is heading for Earth and the only person who can stop it is government scientist Doctor Von Quark, but he has disappeared. Rose works out that a doomsday cult that wants the end of civilisation is behind the kidnap.
The new team has to set aside their individual reservations about working together when they discover that the world's most famous monuments are being vandalised. The Eiffel Tower, the Taj Mahal and the Great Wall of China have all been covered in provocative art work which mocks the host country. Now it's jeopardising the worldwide anti-SKUL treaty.
New spies Carrie and Oscar are still trying to earn their stripes with espionage leader Frank London and the pressure increases as they are told that they are still on trial. Together with the more experienced Rose, they have to work against the clock to stop a mystery criminal who is robbing all the banks in the country.
Oscar's photograph has been uploaded onto the internet and has been seen by the wrong eyes - those of the Grand Master, who sends Agent X, the world's most notorious agent, after Oscar. Team boss Frank London has calculated that Agent X, who has never failed a mission, will be at St Hope's School in four hours and Oscar must escape.
The MI High agents are protecting Dr Wallis, the inventor of The Mind Machine, a device that turns bad people good. However, the evil Grand Master has got wind of the device and wants to use it to turn good people bad, and sends a SKUL agent to capture Dr Wallis and his invention.
As half-term approaches, Rose is on a training course and Oscar and Carrie are expectantly awaiting an exciting new mission at HQ. Frank, however, receives a call and suddenly sends them home. Disappointed and suspicious, Carrie and Oscar leave school. It must be something to do with Frank's incredible invention, the Dark Star, which emits darkness and can turn a large area pitch-black in an instant.
Jed Black, MI9's head of training, arrives at St Hope's to get the spies fit and they endure a day of exercise. Meanwhile, a strange newcomer, Luvabitz, arrives in his wurst van and hands out the free, greasy, delicious wursts. The kids and Frank become addicted and simply cannot get enough of them. As a result, they are getting fatter and fatter. Where will it all end?
It's the day MI9 has been waiting for - a chance to catch the Grand Master himself. He is holding a meeting of the 'big six', where six of the world's greatest criminal minds are gathering to decide who will be the next Grand Master. To help teen spies Rose, Carrie and Oscar track down their arch-Nemesis, MI9 sends them their most advanced gadgets yet.
Rose has been selected for the National Academy of Brilliance. It's a once-in-a-lifetime opportunity, but she is devastated - it means she has to leave MI High for good. Frank, meanwhile, fills the remaining spies in on their latest mission. Genius Dr Vince is selling his inventions to anyone who will buy them so Oscar and Carrie embark on an operation to investigate his laboratory.
Katrina Houseman thinks that the evil Uzhmanis stole her top secret project N80, a real life Neanderthal, and plan to clone him to create a Neanderthal army.
Someone is draining Britain's power at a rapid rate and the country is facing an energy crisis. The only hope is Raymond Stilt and his genius invention, The Glove, a renewable-energy generator that is entirely solar-powered. However, The Glove is not ready and needs testing, and the only people who can help are the MI High spies.
An international gymnastics competition comes to St Hope's with potentially disastrous consequences for national security and the Prime Minister. Carrie faces her most difficult mission so far as she is asked to exploit her friendship with her Boldovian pen pal and fellow gymnast Lena Larsson. Carrie must try to find out about Boldovia's cruel regime and what they are planning.
The spies put Flopsy, the Grand Master's adored pet rabbit, up for ransom. Surely the Grand Master won't be able to resist and Oscar will finally be reunited with his mum? Oscar's mum leaves a covert message in his favourite magazine revealing she is still being held captive by SKUL and is ill. Can the team find a way to get her back?
MI High reaches for the stars when the spies are launched into space, with no idea of how to fly the rocket. A SKUL space probe has landed on the moon and MI9 suspects SKUL is using it to spy on the world. The spies must find out exactly what SKUL is up to and put a stop to it.
The Grandmaster sets off a Despair Bomb that emits fear, anger and hate, leaving the entire country grey and miserable. Carrie's optimism is the only thing that can stop the effects of the bomb and save the world.
A crime wave is sweeping the nation and SKUL are responsible - or are they? Not content with being an underling, the Grandmistress has conspired to get rid of the Grandmaster and take over SKUL. The spies must stop her fluffy, animatronic army and put an end to the Grandmistress' reign once and for all - but it seems an impossible mission. Will they succeed, whilst keeping their jobs and integrity?
The UK is hit by a massive earthquake, with multiple epicentres all over the country. Professor Quakermass, a brilliant seismologist, contacts Frank. He thinks that there is more to these earthquakes than meets the eye.
Mrs King's memory wipe is failing. Soon she will remember that Rose, Carrie, Oscar and Frank work as spies for MI9. Frank and the spies develop a strategy to help Mrs King forget once and for all. They construct an elaborate mission for her to complete as a real spy. If it works, she should think it was her subconscious mind playing tricks on her and it was all just a dream.
Financial codes from the Bank of England are being leaked and the spies determine that a restaurant owned by celebrity chef Tommy Blumenheck could hold the answer.
The Head of M.I.9 and Stark summon the team to their office. Something big has happened. Jade Dixon Halliday has sent an urgent plea for help. Her cover has been blown within SKUL and she needs to be broken out.
The spies break into MI9 and steal important information, only it's not really them, but robots that look identical to Rose, Carrie and Oscar. Stark is in pursuit of the spies, convinced that they are the culprits. They must prove their innocence and release Frank from an MI9 torture chamber.
The spies receive some intel about filmmaker Lars Von Tripod - every time he makes a film a valuable artefact is stolen. The team lure Von Tripod to St Hope's with a script that features three school pupils who are also spies.
Terry Zucker has invented the best vacuum cleaner in the world - just turn it on and it cleans up all by itself. Every household in the UK has one, including the prime minister. Meanwhile, an important statue has been stolen. The team uncover the culprit, but in the struggle to capture him they accidentally switch on a vacuum capable of creating a black hole.
Olaf and Hannah Stein are the cleverest people in the world. They have developed the MI9 computer firewall and no one else in the world can crack it, so when they are kidnapped, the spies are left holding their baby, Grace.
Mr Flatley receives a letter from his Great Aunt Jemima informing him that she has left part of her fortune to him in her will, but also receives a ransom letter threatening to blow up the school unless he turns the money down.
An archaeological dig has come to St Hope's to investigate the mysterious disappearance of a Roman legion, and it is getting worryingly close to HQ. The spies must stop the archaeologists from uncovering HQ.
The spies must protect a ship carrying the last component required to make a nuclear bomb. They use Frank's mini-submarine to follow the ship and are making good progress underwater when the ship is attacked.
The spies think they've uncovered a plan by the Grand Master to kidnap the Prime Minister but instead they discover that the Grand Master is meeting the Prime Minister to sign a peace treaty.
When Rose, Carrie and Oscar are captured by the Grandmistress, Frank is determined to rescue them. Using an invention called `Smart Ease', invented to dramatically speed up agent training, Frank turns three more St Hope's pupils into MI9 agents.
Rose is friends with Bodleian, the world's first artificially intelligent computer and when he is attacked by SKUL agent Theo Phantom the spies try to stop him.
The staff and students of St Hope's are left under the Grand Master's control after they are hypnotised by a colourful pattern during a rare solar eclipse. Frank, Oscar and Carrie and even Mrs King manage to escape the hypnosis - but Rose is caught in its spell. Whilst the spies search for answers, the Grand Master launches stage two of his plan: broadcasting the image on every TV in the UK.
Notorious criminal Beryl `the Beefcake' Bagshot, now 85, escapes from prison and is believed to be putting her former gang back together ready for an audacious heist.
MI9 send a mysterious coma patient to St Hope's while they wait for a vaccine, but a team of deadly SKUL ninjas are already on his tail. To make matters worse, Mr Flatley decides to stage a camping trip in the school gym! Can the spies defeat the ninjas and keep their classmates out of danger?
The Grand Master has built a super weapon with only one missing component, an ancient treasure called the Crystal of St Helena. The spies must solve a complex set of clues and track down the crystal before the Grand Master.
The pupils of St Hope's are horrified when a new Slang Prevention system forces them all to speak politely. When someone attempts to sabotage the system by overloading it with power, the spies must save the school from exploding.
When a mysterious attacker threatens the launch of a new fitness device at St Hope's, the team are surprised to find their investigations leading to a local dance school.
When the spies discover the existence of a SKUL school, they send Oscar on an undercover mission. However, as he wins the admiration of his teachers, he is tempted to join SKUL for real.
The world's most deadly poison is stolen from MI9 and the spies suspect that the culprit is eccentric puzzle maker Quillian Pendrix. As Pendrix-mania sweeps the nation, the spies must crack the puzzle and retrieve the poison.
MI9 are on high alert when they learn that an enemy spy has stolen a jacket enabling him to look exactly like a school pupil. As the imposter heads to St Hope's, will the spies be able to identify and stop him in time?
When Oscar walks out on MI9 and goes on a dangerous mission to infiltrate SKUL, Rose and Carrie set out to find the one person who may be able to rescue him: former MI9 super spy Edward Dixon Halliday - Oscar's long-lost father.
The old MI High team have graduated to MI9 and spy handler, Frank London, is on the lookout for a new bunch of intrepid young secret agents. Signing up for duties are: uber resourceful action man Daniel Morgan, master of disguise Aneisha Jones and electronics genius Tom Tupper. The team embark on their first mission: intercepting the enemy's ultimate weapon.
Tempers flare and loyalties are tested when a series of embarrassing incidents threaten to bring down MI9. The team suspect a resurgent enemy organisation called KORPS of coordinating a sting against them but having seen KORPS destroyed ten years ago, Frank has other ideas about who could be behind this. Is there an enemy agent in their midst or are the new team dealing with an even more cunning and evil foe than SKUL?
A madcap adventure ensues for the team when a mysterious fireball crashes in the woods near St Hearts. Believing it to be a UFO, the school pupils swamp the site of what turns out to be an enemy satellite which KORPS are desperate to get hold of. Will the team recover a crucial piece of the wreckage which threatens national security without blowing their cover?
Shunned by the pop world for not having super star looks, embittered music mogul Cuthbert Peabody hijacks a new MI9 invention capable of changing a person's face into anyone elses. He then uses it against the people who he holds responsible for his failure - pop fans. The team must crack a highly elaborate musical code in order to put a stop to Peabody they must turn to an unlikely ally.
The team are on their first international mission to the rogue state of Boldovia where the local secret service has developed a data mining device capable of destroying MI9. On a high octane mission in a foreign land where nothing is what it seems and no one can be trusted, can the team recover the device without raising the suspicions of their fellow school mates?
On a campaign to get kids eating more healthily, St Heart's school is chosen by Celebrity chef Jimmy Jubbly as a test bed for his new health drink - Jubblyade. However Aneisha is quick to discover that it's affecting everyone's behaviour and making them operate with a hive mind. Under threat from her own team mates, can Aneisha single-handedly stop the teens of the nation from wreaking havoc countrywide?
Out of sync with the times, an old-school spy infiltrates the St Heart's spybase and hijacks an MI9 invention capable of reversing technological advances by fifty years. Can the team defeat her with nothing more than out-of-date gadgets and good old-fashioned spycraft before the world is returned to the stone age?
Funded by KORPS, scientific genius Bobby Bleach has brought the country to its knees by releasing a plague of airborne supergerms which have incapacitated eveyone who breathes them in. Tom is the only member of the team who escaped infection, but can he overcome his fear of being in the field and stop Bleach before it's too late?
A number of top secret scientific components have been stolen in recent weeks by a thief dressed as a character from a best selling series of fantasy novels. The investigation sees the team infiltrate a fantasy convention only to discover the threat is far greater than they anticipated. Can Dan put his faith in the power of the imagination in order to defeat The Dark Wizard?
Frank checks into a nightmare treatment centre, which KORPS' has infiltrated in order to steal secrets directly from the brains of MI9 agents. With the threat of nuclear destruction looming, the team are faced with their most difficult dilemma yet - to save Frank's life or to rescue Britain from catastrophe. Will they choose the greater good over the well being of their beloved spy handler?
Sent to Uttland on the pretence of being on a school trip, the team must break into the country's deepest, darkest prison to help a former KORPS leader escape. However things go awry when their classmates are falsely imprisoned by fearsome prison warden, Arme Gonnersson. Can the team jailbreak an entire class without breaking their cover?
Briefed to protect Grand Duke Nicholas, the heir to the throne of a small European state. The team hide him in St Heart's, where the arrogant prince must learn to behave as a commoner with hilarious consequences. Can the team protect this spoilt royal who refuses to submit to authority?
The pieces of the puzzle begin to fall into place when the team finally discover the grand scheme KORPS has spent the last ten years building towards. Will the team lose one of their own to the dark side?
It's a new term at St Hearts and with Zoe still away, spy handler Frank tasks the elite spies with the mission of tracking down one of Zoe's remaining duplicants, Keri, who is the new intended host of the Mastermind's consciousness! It's becomes a race against time to reach Keri first and save her from the clutches of KORP.
When the spies happen upon a mysterious Lost-style hatch in the school grounds, they find a KORPS device designed to create Super Soldiers and Frank is accidentally transformed into a dangerous, bulked-up, FRANK-enstein! The Team and new recruit Keri, must protect the school from the unexpected enemy that is Super Soldier Frank and save his humanity before it it's too late.
Clairvoyant Derren Beige becomes an overnight sensation by correctly predicting the outcome of various events, only to be promptly kidnapped by KORPS.
When Government Food Advisor 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.
During a successful MI9 mission to secure Samantha Stiletto, the world's most deadly assassin, a series of unfortunate events lead to KORPS mistaking Keri for the assassin!
When the Team gets word that KORPS have a Weapon of Mass Destruction, it's all hands on deck! But to find the answers in the present our Spies must investigate the past.
The Dark Wizard is alive! Tom discovers the online, Dark Wizard Avatar from the Blade Quest game has become self-aware but nobody believes him. Tom must go into the Blade Quest game and enlist the help of gifted gamers, Mr Flatley, Roly and more surprisingly Mrs King - and their avatars are unknowingly roped in to help save the world...
Dan is drawn to the world of the Guardian Runners, but when he's faced with the reality of who his heroes really are, Dan's forced to make a choice about his future.
Spy handler Frank is honoured and totally bowled over when he's invited to join a top secret order, the League of Mata Hari. However, the curious spies can't help but probe and their meddling leads them to a criminal conspiracy deep within MI9 that includes top brass! The team risk their careers and their lives to lead the purge of the traitors.
Mysterious anti-capitalist group the 99p is threatening to bring down the global economy by stealing an MI9 device that can take control of all telecommunications devices. In trying to stop the 99p, the spies discover a surprising sinister link to the advertising agency that Mrs King has hired to boost St Hearts' income levels.
KORPS has abducted the country's most famous agony aunt, Mandy Pluckey. In addition to solving teenagers' troubles, she's the trusted confidante of the Prime Minister.
The now jobless spies have set up as freelance International Security Experts, but it is not exactly booming! The team are about to give up when a government worker comes to them for help.
The world's most evil villains have now infiltrated every major organisation in the country and in a matter of hours, the PM is due to sign over power to the deputy prime minister, Evelyn Baxter, aka the crime minister!
Complete episode guide for M.I. High with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
This episode guide is organized by seasons, making it easy to track your viewing progress or find specific episodes. Use the episode information to plan your binge-watching sessions or catch up on missed episodes.