https://en.wikipedia.org/wiki/The_Big_O

The Big O (Japanese: THE ビッグオー Hepburn: Za Biggu Ō) is a Japanese anime television series created by designer Keiichi Sato and director Kazuyoshi Katayama for Sunrise. The writing staff was assembled by the series' head writer, Chiaki J. Konaka, who is known for his work on Serial Experiments Lain and Hellsing.

The television series is designed as a tribute to Japanese and Western shows from the 1960s and 1970s. 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 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 Big O premiered October 13, 1999 on WOWOW satellite television. It finished its run on January 19, 2000. The English-language version premiered on Cartoon Network on April 2, 2001 and ended on April 18, 2001. Originally planned as a 26-episode series, low viewership in Japan reduced production to the first 13. Positive international reception resulted in a second season consisting of the remaining 13 episodes; co-produced by Cartoon Network, Sunrise, and Bandai Visual. Season two premiered on Japan's SUN-TV on January 2, 2003, and the American premiere took place seven months later.

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