M.I. High - Season 4 - Eps 13: The Octopus
The spies have a vital mission - they must protect a ship carrying the last component required to make a nuclear bomb. Other ships carrying nuclear parts have been raided by pirates and MI9 have intelligence to suggest that this ship will be targeted. The team use Frank's mini-submarine to follow the ship, in an undercover, underwater mission. Meanwhile, Frank is very worried about the team since his cousin Charlton went missing in the same waters some years back and was never found.
About M.I. High

Title: M.I. High
First Air Date: 2007-01-08
Last Air Date: 2014-03-31
Status: Ended
Rating: 6.2/10 (from 17 votes)
Language: EN
Seasons: 7
Total Episodes: 88
Network: BBC One
Genres: Action & Adventure, Crime, Drama, Family
Production Companies: Kudos
Synopsis
M.I. High is a BBC children's spy-fi adventure series. It was produced for the BBC by the independent production company Kudos, who also produced the hit BBC spy drama Spooks. It follows in the success of the Young Bond and the Alex Rider series of books and films. M.I. High is recorded in high definition and is shown on the CBBC Channel and CBBC Outputs on BBC One and BBC Two. M.I. High is also shown on the BBC HD Channel. Repeats also frequently air in Australia on ABC3. As of October 2012 the series has began airing on the UKTV channel Watch.
Cast

Pollyanna McIntosh
Crime Minster