Development of the
retro-styled series began in 1996.
Keiichi Sato came up with the concept of
The Big O: a giant city-smashing robot, piloted by a man in black, in a
Gotham-like environment. He later met up with Kazuyoshi Katayama, who had just finished directing
Those Who Hunt Elves, and started work on the layouts and character designs. But when things "were about to really start moving," production on Katayama's
Sentimental Journey began, putting plans on hold. Meanwhile, Sato was heavily involved with his work on
City Hunter. The initial story idea revolved around a cataclysm (caused by a meteorite impact) that destroyed most of human civilization. Konaka deliberately chose to present the setting, Paradigm City, as a city of amnesiacs to avoid needing to develop lore for the origin of the show's mecha. In April 2001,
The Big O premiered on
Cartoon Network's
Toonami lineup. The series garnered positive fan response internationally that resulted in a second season co-produced by Cartoon Network and Sunrise. Season two premiered on Japan's
Sun Television in January 2003, with the American premiere taking place seven months later as an
Adult Swim exclusive. The second season would not be seen on Toonami until July 27, 2013, 10 years after it began airing on Adult Swim. The second season was scripted by Chiaki Konaka with input from the American producers. Cartoon Network raised two requests for the second season: more action and reveal the mystery in the first season, although Kazuyoshi Katayama admitted that he did not intend to reveal it, just to make an anthology of adventures set in the universe. Along with the 13 episodes of season two, Cartoon Network had an
option for 26 additional episodes to be written by Konaka, but according to Jason DeMarco, executive producer for season two, the middling ratings and DVD sales in the United States and Japan made any further episodes impossible to be produced. Following the closure of Bandai Entertainment by parent company in 2012,
Sunrise announced at
Otakon 2013 that
Sentai Filmworks rescued both seasons of
The Big O. On June 20, 2017, Sentai Filmworks released both seasons on Blu-ray.
Music The Big O was scored by
Geidai alumnus
Toshihiko Sahashi. His composition is richly symphonic and
classical, with a number of pieces delving into
electronica and
jazz. Chosen because of his "frightening amount of musical knowledge about TV dramas overseas," Composed, arranged and performed by Rui Nagai, the song resembles
the theme to the
Flash Gordon film. The second opening theme is "Respect," composed by Sahashi. The track is an homage to the music of
UFO, composed by
Barry Gray. In 2007, Rui Nagai composed "Big-O! Show Must Go On," a 1960s
hard rock piece, for
Animax's reruns of the show; this composition replaced the original opening themes for the Blu-Ray release of the series. The closing theme is the slow love ballad "And Forever..." written by Chie and composed by Ken Shima. The duet is performed by Robbie Danzie and Naoki Takao. Along with Sahashi's original compositions, the soundtrack features
Chopin's
Prelude No. 15 and a jazz saxophone rendition of "
Jingle Bells." The complete score was released in two volumes by
Victor Entertainment. ==Design==