Gerry Anderson Associated Television (ATV) boss who offered to buy the show. This began a long friendship and a very successful professional association between the two men. The new series, "Supercar", (1960–61) was developed by Gerry & Sylvia Anderson and Reg Hill based on a story written by Sylvia Anderson and marked several important advances for APF. Sylvia Anderson took on a larger role and became a partner in the company. The series was also the official debut of Supermarionation, the electronic system that made the marionettes more lifelike and convincing on screen. The system used the audio signal from pre-recorded tapes
Gerry Anderson space adventure "Fireball XL5" (1962). At the time it was the company's biggest success, garnering the honour of being the first Anderson series sold to an American TV network, NBC-TV. Around this time, Anderson also saw his Supermarionation style attract imitators—most notably "Space Patrol", which used similar techniques and was made by several former employees and associates of Anderson, including Arthur Provis and Roberta Leigh. After the completion of "Fireball XL5", Lew Grade offered to buy AP Films. Although Anderson was initially reluctant, the deal eventually went ahead, with Grade becoming the managing director, and the Andersons, Hill, and Read