Four British teens on vacation visit an island and discover that a terrorist group is using it as their headquarters.
| Actor | Role |
|---|---|
 Norman BowlerBill Smugs | Bill Smugs |
 Wilfrid BrambellUncle Jocelyn | Uncle Jocelyn |
 Eleanor SummerfieldAunt Polly | Aunt Polly |
 Catherine SchellAlison Mannering | Alison Mannering |
 John Rhys-DaviesSmith | Smith |
 Leon LissekJo | Jo |
 Paul WilliamsonM.I.5 Boss | M.I.5 Boss |
 Frank WilliamsMap Shop Owner | Map Shop Owner |
 Peter Forbes-RobertsonMr. Roy | Mr. Roy |
 Julie NeesamMaggie | Maggie |
| JJohn Forbes-RobertsonMr. Roy | Mr. Roy |
| PPatrick FieldPhilip Mannering | Philip Mannering |
 Chloe FranksDinah Mannering | Dinah Mannering |
 Perry BensonJack Trent | Jack Trent |
| DDaryl BackLucy-Ann Trent | Lucy-Ann Trent |