Ultraman Gaia: Gaia Again otherwise known as Ultraman Gaia: Once Again Gaia, is a 2001 direct-to-video special set a few years after the end of Ultraman Gaia.
Ultraman Gaia: Once Again Gaia – The Movie 2001
After the battle against Zog was over, both Gamu and Fujimiya began to live normal lives until another threat arrives on Earth – a surviving monster soldier of Zog’s army named Gakuzom.
Ultraman Gaia: Gaia Again – The Movie 2001