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 his goal of making live-action film and TV drama. During the production of "The Adventures of Twizzle", Anderson started an affair with secretary Sylvia Thamm and ultimately left his wife and children. Following his divorce from his first wife, Anderson married Thamm in November 1960, while he was working on "Four Feather Falls". AP Films' third series was the children's western fantasy-adventure series "Four Feather Falls" (1959–60). Provis left the partnership, but the company retained the name AP Films for several more years. "Four Feather Falls" was the first Anderson series to use an early version of the so-called "Supermarionation"