High is a British action television series produced by Kudos for CBBC and created by Olivia McRae.
The series focuses on a team of undercover teenage spies working for the fictional secret intelligence agency M.I.9 who have to balance their school life with their jobs as secret agents.
The line-up of spies has altered between the show's seven series.
The series premiered on 8 January 2007 and originally ended on 21 March 2011 after five series, before being revived for a further two series that were broadcast between 7 January 2013 and 31 March 2014.
The show was cancelled in 2015, as the main filming locations of the series no longer existed.