In September 2010, Nelvana Entertainment announced a fourth and final season to the "Bakugan" series titled , which launched on February 13, 2011 in Canada and in United States on March 5, 2011. It was originally set for 26 episodes but was later extended to 46. While "Mechtanium Surge" was produced for North American audiences and was never aired in Japan, a localized version aired in Taiwan and Hong Kong, using a modified version of the "New Vestroia" credit animations and songs.