What was the English film producer Gerry Anderson's first TV children's series?

Gerry Anderson (born Gerald Alexander Abrahams; 14 April 1929 – 26 December 2012) was an English television and film producer, director, writer and occasional voice artist. He remains famous for his futuristic television programmes, especially his 1960s productions filmed with "Supermarionation" (marionette puppets containing electric moving parts).

Anderson's first television production was the 1957 Roberta Leigh children's series "The Adventures of Twizzle". "Torchy the Battery Boy" (1959-1961), "Supercar" (1961–62) and "Fireball XL5" (1962–63) followed later, both the later two series breaking into the US television market in the early 1960s. In the mid-1960s Anderson produced his most successful series, "Thunderbirds". Other television productions of the 1960s include "Stingray" and "Captain Scarlet and the Mysterons".

"The Adventures of Twizzle" was a children's TV show that premiered in 1957. The show follows Twizzle and his companions on adventures. Twizzle has the ability to extend his arms and legs. Although 52 episodes of the show were created during the show's year-long run in 1957, only one of the episodes has managed to survive. The series was one of the first shows to use intricate puppetry which would prove important in later shows developed by Gerry Anderson.