ultraman tiga: the final odyssey
The theatrical movie spin-off to Ultraman Tiga, released in 2000.
Picks up two years after the series ended, and seven years before Ultraman Dyna.
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.
This tag implicates ultraman_tiga_(series) (learn more).