Crisis, super komputer milik Alchemy Stars [perkumpulan anak muda genius ] memprediksikan bumi dan manusia akan musnah oleh sesuatu yang di sebut KHST [Kongenteki Hametsu Syourai Tai ]. Salah satu anggota Alchemy Stars bernama Gamu Takayama secara tidak sengaja mendengar suara keinginan bumi dan dapat berubah menjadi ULTRAMAN GAIA ketika KHST menyerang untuk pertama kalinya.
ULTRAMAN GAIA di kenal sebagai serial ULTRAMAN dengan cerita yang sangat kompleks dengan beraroma konspirasi. Selain itu, menjadi seri pertama yang memunculkan ULTRAMAN kedua sebagai rivalnya, ULTRAMAN Agul. Kehadiran Agul menambah kerumitan cerita yang dimiliki cerita ini .
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