S4 E1 • Run, Carrie, Run!

The Grand Master steals a despair bomb from M.I.9 and captures Rose, Oscar and Chief Agent Stark. Carrie must put a stop to The Grand Master's evil plan before he plunges the world into eternal despair.

Première diffusion : 4 janvier 2010

S4 E2 • The Bunny Whisperer

A massive crime wave hits. Their friend Maurice Hutchinson gets kidnapped and the spies must secretly find him. But later they find him in an abandond house with the grandmaster. Meanwhile the crimes seem to have some strange evidence... bits of fake fur are getting found at all the crime scenes.

Première diffusion : 4 janvier 2010

S4 E3 • Quakermass

After Britain is shaken by a massive earthquake, the team is contacted by former seismologist Professor Quakermass who discovered that there wasn't just one tremour, but several. Their investigation leads them to Carrie's idol Well Fit Jim, who she claims is innocent.

Première diffusion : 11 janvier 2010

S4 E4 • Mrs. King: License to Spy

The team investigate celebrity chef Tommy Blumenheck's restaurant. This where the Head of M.I.9 and financial heads meet to exchange bank code numbers, but each time they do, SKUL somehow intercepts the code and empties each bank's cash reserves. Meanwhile at St. Hope's, the pupils have a protest against their nasty cafeteria food.

Première diffusion : 18 janvier 2010

S4 E5 • Don't Cook Now

Carrie, Rose, Oscar and Frank discover that a memory wipe they performed on Mrs King is about to fail, when she starts to be convinced she is a spy. Frank gives the agents a new mission: monitor Mrs King because if the memory wipe fails, they will be finished in MI9. Oscar comes up with a plan to trick Mrs King into believing that St. Hope's is an MI9 training facility and that all the students are spies. Mrs King meets a supposed SKUL agent, who turns out really is working for SKUL! The agents are not convinced but are eventually proved wrong. Oscar's plan succeeds and by the time Mrs King's memory wipe fails, they have set everything up to make it appear that it was just a dream.

Première diffusion : 18 janvier 2010

S4 E6 • Return of the Mummy

M.I.9 receive an emergency transmission from Oscar's Mum, she reveals that she'a a mole that has been leaking top secret SKUL data for the last two years. Her cover's been blown and the team must break her out, but they believe that it's all a trap.

Première diffusion : 25 janvier 2010

S4 E7 • Doppelgängers

Rose, Carrie and Oscar are caught on CCTV stealing top secret files from M.I.9 HQ. But it wasn't them, merely robots that were made to look like them. Frank believes that they are innocent, but Stark shows no hesitation in pursuing them. After Frank helps them to escape, they discover the truth about who made the robots.

Première diffusion : 1 février 2010

S4 E8 • High School Spy Movie

Carrie, Rose, Oscar and Frank discover that a memory wipe they performed on Mrs King is about to fail, when she starts to be convinced she is a spy. Frank gives the agents a new mission: monitor Mrs King because if the memory wipe fails, they will be finished in MI9. Oscar comes up with a plan to trick Mrs King into believing that St. Hope's is an MI9 training facility and that all the students are spies. Mrs King meets a supposed SKUL agent, who turns out really is working for SKUL! The agents are not convinced but are eventually proved wrong. Oscar's plan succeeds and by the time Mrs King's memory wipe fails, they have set everything up to make it appear that it was just a dream.

Première diffusion : 8 février 2010

S4 E9 • Black Hole

An expensive golden statue has been stolen from the PM. The team's investigation brings them to Terry Zucker, inventor of the Zucker vacuum cleaners that move around all by themselves. Only his vacuums seem to do a little bit more than just clean up and the team get more than they bargained for when Zucker's new Mega-Zucker accidentally activates, creating a black hole!

Première diffusion : 15 février 2010

S4 E10 • Three Spies and a Baby

Britain's cleverest couple, the Steins, are kidnapped by the Grandmaster after they built an immensly difficult to crack firewall for MI9 on the way to a conference, however their baby daughter Grace is still safe. Chief Agent Stark is extremely angry that Rose, Carrie and Oscar allowed the Steins to be kidnapped from under their noses and tells them that as he will be sending out his best agents, they can look after the baby, much to Rose and Carrie's dismay. Oscar however is over the moon and adores Grace as if she were his own sister and is more than willing to look after, to the relief of Carrie and Rose. Oscar discovers that Grace is highly intelligent. While this is happening, the Grandmaster forces the Steins to hack into MI9's computer network, and Rose tells Stark to take the MI9 Mainframe offline, which he reluctantly agrees to do. The Steins are dismayed by this as this means they cannot fulfill the Grandmaster's wishes, nor can they see Grace. Instead, the Grandmaster orders them to make a firewall for SKUL. While this is happening, Rose has an idea and plugs Grace into the computer that the Steins have built, enabling her to hack into SKUL's mainframe. After finding them, Stark furiously tells them that they have disobeyed orders while the Steins gratefully take Grace.

Première diffusion : 22 février 2010

S4 E11 • Millionaire Flatley

Mr Flatley is excited when he gets a letter saying that his Great Aunt Jemima has left him a million pounds in her will. Of course, all the students of St. Hope's immediately try to get into Flatley's good books, hoping to get a share of the money. While Flatley is celebrating however he receives a ransom note threatening to blow up the school unless he turns down his share of the money and warning him not to go to the police. The note is taken to HQ where Frank discovers traces of Dugranite on it, a rare but powerful explosive - finding this, they know that whoever sent the note is serious - there is a bomb in the school and Rose finds a DNA sample on the envelope. They are also alarmed to discover that the last delivery of Dugranite was six weeks ago - to SKUL. Flatley is in a state of panic but Frank assures him he will find the bomb and defuse it. Mrs King does not know about the bomb so is annoyed when Flatley tells her, "Frank is my new best friend". Frank then gives Oscar, Carrie and Rose a task: Flatley's other three relatives will be arriving for the reading of the will in Flatley's office and they are to get a sample of DNA from them to compare with that of the bomber - presumably one of them is the bomber and working for SKUL. The other relatives are Jeannette, a posh vicar who's young people's drop-in centre is in danger of closure due to lack of funding, Nozzy, a failing rock star, and Hamish, a Scottish university Chemistry lecturer. However when they compare all three DNA samples, none of them match the bomber's. They are forced to conclude that this means the bomber is someone else, and they continue searching. Rose, however, examines the note and notices that to prevent handwriting analysis, the letters have been cut out of an American newspaper. She does some more research and discovers that one of the relatives, Dwayne, is living in America. He has a certain fondness for kittens and blew up his house in an experiment involving Dugranite! He was now renting a lock-up around the corner, where Rose goes to search for more clues. What she does find are lots of kitten photos and a poster reading SKUL, partly covered by more kitten photos. Rose removes the photos and is shocked to discover that Dwayne doesn't work for the Grandmaster, but for a charity - Save Kittens with Unconditional Love. She is also alarmed to discover a small sample of liquid Dugranite - it had been brought into the school in a vase of flowers. She reports this to Frank, who has been forced into the meeting where the will is being read out by Mrs King, who suspects him of trying to get hold of Flatley's money. Meanwhile Oscar and Carrie find Dwayne in a store cupboard and that he has bugged the meeting. Before the solicitor reads the will, Flatley interrupts much to the annoyance of the solicitor and demands to know which one of his relatives sent him the note about the bomb. It is then revealed that each of the relatives had received a ransom note, threatening Jeannette's church, Nozzy's shed (where he kept his drumkit) and Hamish's lecture theatre. Dwayne listens as the relatives in turn refuse their share of the money, but when Flatley accepts his, he detonates the bomb in despair. When Oscar shouts at him, "You'll blow up this whole school!" he replies sadly, "If SKUL don't get the money, life's not worth livin'." Carrie however tricks him into believing that Flatley kept kittens in the school and that blowing up the school would make Dwayne a kitten killer. He immediately goes to stop the bomb detonation but discovers that he can't. Oscar sends a Morse Code message to Frank by banging on the pipes, and Frank jumps up and throws the vase out of the window, with seconds to spare. The solicitor then announces that because Jeannette, Nozzy and Hamish refused the money, it automatically went to Flatley. He is delighted by this news but his happiness is short-lived when the solicitor takes the million pounds for himself, saying that it was because he had been worked overtime and had his time wasted, leaving Flatley with five pounds, which the other relatives think is hilarious and fall about laughing. Mrs King, however, is furious at this and snatches the five pounds from Mr Flatley, as he owed her five pounds when she lent him some to buy a sandwich. A devastated Flatley runs out of his office into the corridor where the rest of the students are waiting expectantly, and sobs, "I've spent it all ... on a sandwich!" to which everyone responds by giving a sigh of disappointment.

Première diffusion : 1 mars 2010

S4 E12 • SKULdiggery

Roman remains have been found at St Hope's, an archaeological dig has come to investigate and it is getting worryingly close to HQ. Archaeologists have uncovered remains from the Ninth Legion, who's disappearance was one of the greatest mysteries in the world. But when SKUL are found at the dig site, the team's jobs are at stake. Furthermore, the dig is getting dangerously close to the lift shaft. Our spies must stop the archaeologists from uncovering HQ and put a stop to SKUL using the most deadly bio-weapon in history.

Première diffusion : 8 mars 2010

S4 E13 • The Octopus

Pirates have been raiding numerous trade ships, stealing components to make a nuclear warhead. Their leader The Octopus, has plans to blow up the polar ice caps and flood the world to protect the world's marine life from humans. The team is tasked with protecting a ship with the final component for the warhead, but when they're are captured and The Octopus' true identity is revealed, Frank is torn between what to do.

Première diffusion : 15 mars 2010