TV series
A team of undercover teenage spies working for the fictional British secret intelligence agency MI9 who have to balance their school life with their jobs as secret agents.
Streaming, rental and purchase options
Checked Sep 2, 2026
M.I. High is available to stream on Prime Video and Amazon Freevee in United States. Use the direct links below to open the provider.
A team of undercover teenage spies working for the fictional British secret intelligence agency MI9 who have to balance their school life with their jobs as secret agents.
Choose an episode, then use the watch options above for the show.
Episode 1
At an award ceremony for M.I. 9, the world's greatest illusionist makes the President of the United States disappear - permanently.
Guest stars Holliday Grainger, Julian Bleach, Alan Cox, David Hounslow
Episode 2
A bumbling inventor's Artificial Intelligence unit tries too hard to enforce the school rules.
Guest stars Simon Greenall, Paul Reynolds, Sion Tudor Owen
Episode 3
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.
Guest stars Julian Bleach, Andres Williams, Chloe Hesar, Marc Elliott
Episode 4
Britain's young people are laid low by a strange sleeping sickness.
Guest stars Julian Bleach, Colin McFarlane, Joy Brook, Dean Bardini
Episode 5
The team investigates when their schoolmate Lenny becomes the latest one arrested in a new wave of inexplicable crimes by previously honest kids.
Guest stars Tommy Bastow, Martin Hancock, Dominic Applewhite, Krishnan Naidoo, Evelyn Duah
Episode 6
The high school spies become concerned when a Member of Parliament proposes sending misbehaving British children to a remote island.
Guest stars Felicity Montagu, Brian Peck, Eileen Page, John White, Krupa Pattani, Tim Hewitt
Episode 7
A new Cold War is in the making, but this time it's the Grandmaster's plan to give everyone the flu.
Guest stars Julian Bleach, Darren Southworth, Tony Longhurst, Bill Aitchison
Episode 8
It's Daisy's worst nightmare when a plague of head lice hits the school, and turns the kids into master criminals.
Guest stars Julian Bleach, Sally Bankes, David Charles
Episode 9
The high school spies are amazed to discover that they have competition -- there is another team of young people working for MI9.
Guest stars Steven Meiklejohn, Tommy Bastow, Simon Farnaby, Shakira Ley, Nicholas Clayton, Ryan O'Donnell
Episode 10
The world's most famous diamonds are being stolen, and the team suspects the captain of the all-England football team.
Guest stars Abdul Salis, Troy Glasgow, Robert Wilfort, Caroline Bernstein
Episode 11
A new invisible spy plane is stolen by a mysterious unknown pilot.
Guest stars Julian Bleach, Ian Hughes, Jemma McKenzie-Brown, Terry Bird, Julian Stolzenberg
Episode 12
Plants rise up and attack anti-green targets, so Blane goes into action.
Guest stars Simon Greenall, Alastair Mackenzie, Robin Pearce, John Warnaby, Amy Booth-Steel
Episode 13
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.
Guest stars Robert Llewellyn, Tim Downie, Julian Bleach, Phil Cornwell, Mark Powley
Episode information updated Sep 19, 2026
Danny John-JulesLenny Bicknall
Bel PowleyDaisy Millar
Rachel PetladwalaRose Gupta
Ben KerfootOscar Cole
Chris StantonMr Flatley
Jane CameronMs Templeman
Scott GibbinsStewart Critchley
BBC OneUnited Kingdom
CBBCUnited Kingdom
KudosUnited Kingdom
BBCUnited Kingdom
