1 Season
13 Episode
The Secret Service - Season 1 Episode 9 The Deadly Whisper (1969)
Professor Soames has developed a sonic rifle, capable of projecting destructive waves of ultrasonic vibration, accurate to within a centimetre over thirty feet. But three unscrupulous saboteurs intend to use Soames' rifle to bring down an experimental aircraft, holding the Professor's daughter hostage to ensure his complicity. When Father Unwin becomes suspicious and investigates, he too is held prisoner in Soames' house.
- Country : United Kingdom
- Genre : Action & Adventure, Animation
- Studio : Associated Television
- Director : Sylvia Anderson, Gerry Anderson
- Cast : Sylvia Anderson, Stanley Unwin, Keith Alexander, Gary Files, David Graham, David Healy
