For over 45 years, the Gundam series has been produced as TV series, film, OVA and various other media. From the "Universal Century" series, which originates with Mobile Suit Gundam, to the "Alternative" series that feature their own unique timelines, the franchise spans a wide range of stories. There are also the SD Gundam series, originally designed as kids’ anime that have steadily grown in popularity, and the Gundam Build series, which focuses on Gunpla (Gundam plastic model) battles. These spin-offs and expansions reflect the series’ rich variety.