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Four British teens on vacation visit an island and discover that a terrorist group is using it as their headquarters.
Norman Bowler
Bill Smugs
Wilfrid Brambell
Uncle Jocelyn
Eleanor Summerfield
Aunt Polly
Catherine Schell
Alison Mannering
John Rhys-Davies
Smith
Leon Lissek
Jo
Paul Williamson
M.I.5 Boss
Frank Williams
Map Shop Owner
Peter Forbes-Robertson
Mr. Roy
Julie Neesam
Maggie
