Seikimatsu Densetsu Wonderful Tatsunoko Land is a special anime that premiered in fall 1999, produced by Tatsunoko Production.

About the production: the story comes from an original script, there is 1 episode of about 30 minutes and its current status is "finished".

Its main genres are comedy, with themes such as Crossover.

The excessive adventure begins when a mysterious flying life-form, UBO came to "Tatsunoko Anime World Island" where all the Tatsunoko animation characters live. TV special animation program featuring all-star Tatsunoko characters. (Source: Official Website)

Official synopsis from AniList.