Cloud Burst (1974)

Cloud Burst tells the story of Tim and Jenny Barber. When they lose their model aeroplane, they meet Ram Pandit, a kindly scientist working on a rainmaking machine to help the people of his native India. Unfortunately, Ram's evil twin Ravi (played by the same actor - Renu Setna) wants it himself and steals it. Tim and Jenny save the day, but Ram discovers a spy in his camp. Richard Carpenter presented the studio bits, with Wordy (Mr Watchword, to give you his full name) appearing for the first time.