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
Supercar (TV series) make a good Masterspy, while Gould remembers Murcell doing "all the European voices". Murcell left the series after 24 episodes, which explains why he, and Popkiss do not appear in the last two episodes of the first series. Sylvia Anderson, then Sylvia Thamm before her marriage to Anderson, was credited as "voice direction", and voiced Jimmy Gibson and all female characters in the series; however, she was not credited for the first series. Originally Sylvia was not to voice Jimmy, but she was given the opportunity when Gerry was not happy with the original voice of Jimmy that had already