Invincible King Tri-Zenon

Invincible King Tri-Zenon (無敵王トライゼノン) is a Japanese anime television series created by E&G Films. Directed by Takashi Watanabe and written by Katsumi Hasegawa, the anime's 22 episodes were broadcast on TBS between October 14, 2000, and March 17, 2001. It took over the Saturday 17:30 - 18:00 timeslot once claimed by the Sakura Wars TV series.

Video game
On March 9, 2001, Marvelous Entertainment released a Game Boy Color video game adaptation.

Anime
The anime uses two pieces of theme song. "Unsteady" is the series' opening theme while "Lost in You" is the series' ending theme. Both are sung by Megumi Hayashibara.