Also known as: THE_FINAL_ODYSSEY
The theatrical movie spin-off to Ultraman Tiga (Series), released in 2000.
Picks up two years after the series ended, and seven years before Ultraman Dyna (Series), hence the cameos of the characters from said series.
It serves as a epilogue to Tiga, as well as a prequel to Dyna, even though the movie was released two years after both shows ended.