FLCL season 1

Retroactively known as the first season of the FLCL series, all episodes of the 2000 Japanese original video animation series were directed by Kazuya Tsurumaki and produced by the FLCL Production Committee, which included Gainax, Production I.G, and Starchild Records. The English adaptation was licensed by Synch-Point, which released the DVDs and soundtrack. After Synch-Point went out of business, Funimation licensed and re-released the series on Blu-ray and DVD. The story follows Haruko Haruhara, a sociopathic alien drawn to the fictional Japanese suburb of Mabase by the Medical Meccanica building while weaseling in the lives of twelve-year-old Naota Nandaba in the first season and fourteen-year-old Hidomi Hibajiri in the second season as pawns in her agenda to acquire the being called Atomsk.

The first-season episodes aired in North America on Cartoon Network's Adult Swim programming block from August 4 to August 13, 2003.

Six pieces of theme music are used for the episodes; five opening themes and one closing theme. All the theme songs are by Japanese rock band the Pillows. The opening themes are: "One Life", used in episode one, "Instant Music" in episode two and three, "Happy Bivouac" for episode four, "Runners High", utilized in episode five, and "Carnival" in episode six. The closing theme is "Ride on Shooting Star", used for all episodes. Geneon Entertainment has released three original soundtracks encompassing the aforementioned songs, with soundtracks titled Addict, released on January 20, 2004, King of Pirates, released on September 7, 2004, and FLCL No. 3, released on June 7, 2005.

Six DVD compilations, each containing one episode, were released in Japan by Gainax. In addition, a DVD collection box, containing all six DVD compilations, was released in Japan on August 13, 2005. Three compilations were released by Synch-Point in North America. A DVD collection, containing all six was released on January 23, 2007. The series was re-picked up for distribution by Funimation in 2010 and released again on DVD and on Blu-ray in February 2011.