Bakugan: Mechtanium Surge (found Japanese version of anime series; 2011)
Date found: Sep 2018
Found by: bilibili
Bakugan: Mechtanium Surge is a Japanese-Canadian anime series by TMS Entertainment, Nelvana Enterprises, Spin Master and Japan-Vistec. It is the fourth and final season of the original Bakugan: Battle Brawlers television show. Mechtanium Surge ran for 46 episodes between 2011 and 2012.
The season has yet to be released in Japan, as the show's time slot was replaced by the girls-oriented Bakugan spinoff Zoobles. Local marketing then shifted to a shorts series known as Baku-Tech Bakugan before the franchise went into a hiatus. A Japanese version of Mechtanium Surge was produced. Many foreign dubs are an adaptation of it, rather than the English version. Most notably, the Vietnamese release of Mechtanium Surge (Chiến Binh Bakugan: Cỗ máy ác quỷ) opted out of a full-scale dub like prior seasons and instead had a narrator read the translated lines. The original Japanese audio can be heard in the background.
For years, the only way to hear the Japanese version of Mechtanium Surge was through the background audio in the Vietnamese release. This changed in September 2018, when the season was officially uploaded onto Chinese streaming service bilibili with Japanese audio and Chinese subtitles.