M.I.9 is a secret British goverment service. It runs the M.I.High project which was a secret project up until Series 4 when S.K.U.L discovered that children were now agents.
The M.I.High project was based at Saint Hopes in a secret base hidden 230 feet below the school up until Series 6 when the M.I.High project was moved to Saint Hearts.
As seen in "One Flew Over the Budgie's Cage", Frank London was awarded the M.I.9 medal for bravery. It is revealed that a Code Zero refers to worst case scenarios.