Sylvia Anderson first episode of a series then sharing the work according to their strengths. Gerry tended to specialise in special effects and hardware, and Sylvia in character, voices, costume, dialogue, and plotlines. In this way, Anderson contributed plot development and voice work for a series of half-hour shows including "Supercar", "Stingray" and "Fireball XL5". However, she felt the half-hour format was insufficient to fully develop characters and stories, and she persuaded the team's TV producer Lew Grade to extend their shows to a full hour. In the early 1960s, the Andersons co-created the series "Thunderbirds", and Sylvia created the characters. She
Gerry Anderson 1975; Gerry announced his intention to separate on the evening of the wrap party. Sylvia severed her ties with Group Three, and to alleviate his financial plight, Gerry Anderson sold his share of the profits from the APF/Century 21 shows and their holiday home in Portugal to Lew Grade, in return for a one-off payment. Between making the two series of "Space: 1999", Anderson produced a one-off television special, "The Day After Tomorrow" (also known as "Into Infinity"), about two spacefaring families en route to Alpha Centauri, for an NBC series of programmes illustrating current scientific theory for popular consumption.