An instructional film released by the UK Warning and Monitoring Organization which depicts its operations in the lead-up to and aftermath of a hypothetical nuclear attack on the United Kingdom.
| Actor | Role |
|---|---|
 John WelshSector Controller | Sector Controller |
| TTony ThawntonChief Meteorological Officer | Chief Meteorological Officer |
 Edward UnderdownDuty Controller | Duty Controller |
 Valerie Van OstNurse | Nurse |
| MMichael SmeePost Chief Observer | Post Chief Observer |
 Larry MartynPost Observer | Post Observer |
 Guy StandevenPost Observer | Post Observer |
| IIan PattersonDoctor | Doctor |
| RRichard ButlerROC Sector Officer | ROC Sector Officer |
| JJohn GrahamChief Scientist | Chief Scientist |
| BBrian ForsterChief Warning Officer | Chief Warning Officer |
| MMichael McStayFrench Liaison Officer | French Liaison Officer |
| JJill CaryPost Observer | Post Observer |