Father Stanley Unwin is invited to try and prevent a possible sabotage at a demonstration of the Army's latest and most advanced tank and he goes disguised as an Army padre.
As the exercise progresses, it becomes clear to Father Unwin that someone has programmed the Aqua tank to attack the blockhouse where top NATO officials are watching. He goes to the control room where he finds that a senior officer has destroyed the computer and the tank can no longer be remote controlled nor stopped from its destructive mission.
Now he must give instructions to Matthew (who he has stowed away in the tank) as to how to stop the machine manually, a difficult task manipulating the heavy controls for the miniaturized gardener.
Regular Cast[]
Father Stanley Unwin
(Stanley Unwin)
(Stanley Unwin)
Matthew Harding
(Garry Files)
(Garry Files)
The Bishop
(Jeremy Wilkin)
(Jeremy Wilkin)
Mrs. Appleby
(Sylvia Anderson)
(Sylvia Anderson)
Guest Cast[]
Professor Graham
(Keith Alexander)
(Keith Alexander)
Cameo Roles[]
Equipment Used[]
Locations[]
Trivia[]

Attacking aircraft
- The aircraft seen attacking the tank previously appeared as an Angel Interceptor in the series Captain Scarlet and the Mysterons. In fact, the footage is simply a reused clip from the Captain Scarlet episode Winged Assassin.
- Footage of the remote controlled tank was previously seen in the Joe 90 episode Business Holiday.
- The blockhouse was seen in Gerry Anderson's final film Journey to the Far side of the Sun.