Season 5 - Episode Guide

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.