Season two premiered on Japan's SUN-TV on January 2, 2003, and the American premiere took place seven months later. Positive international reception resulted in a second season consisting of the remaining 13 episodes co-produced by Cartoon Network, Sunrise, and Bandai Visual.

Originally planned as a 26-episode series, low viewership in Japan reduced production to the first 13. The English-language version premiered on Cartoon Network on Apand ended on April 18, 2001. The Big O premiered Octoon WOWOW satellite television. The setpieces are reminiscent of tokusatsu productions of the 1950s and 1960s, particularly Toho's kaiju movies, and the score is an eclectic mix of styles and musical homages. The series is done in the style of film noir and combines the feel of a detective show with the mecha genre of anime. The television series is designed as a tribute to Japanese and Western shows from the 1960s and 1970s. When the need arises, Roger calls upon Big O, a giant relic from the city's past.

Dorothy Wayneright and his butler Norman Burg. He provides this 'much needed service' with the help of a robot named R. The series follows Roger Smith, Paradigm City's top Negotiator. The story takes place forty years after a mysterious occurrence causes the residents of Paradigm City to lose their memories. Konaka, who is known for his work on Serial Experiments Lain and Hellsing. The writing staff was assembled by the series' head writer, Chiaki J.

The Big O (Japanese: THE ?, Hepburn: Za Biggu ?) is a Japanese anime television series created by designer Keiichi Sato and director Kazuyoshi Katayama for Sunrise.

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