Bakugan: Gundalian Invaders (ガンダリアンインベーダーズ,Gandarian Inbēdāzu) is the third season of the anime series, Bakugan Battle Brawlers. It contains a total of 39 episodes and made its debut on May 23, 2010 in Canada and on May 29, 2010 in the United States. The original Japanese version began airing on April 3, 2011 on TV Tokyo at 9:00 AM JST.
According to Sega Toys president Isao Kokubun, the third season ties into the global online game project entitled Bakugan Dimensions. It is followed by Bakugan: Mechtanium Surge.
Dan Kuso, Marucho Marukura, and Shun Kazami get caught up in a war between two different alien factions in another universe, teaming up with three new brawlers: the Neathian, Fabia, the new human, Jake, and the undercover Gundalian, Ren, in order to stop the evil Gundalian Protectors, the Twelve Orders, from destroying Neathia, and possibly Earth. They meet these extraterrestrials when they enter through the virtual reality Bakugan Interspace. At first, the Brawlers are decieved into thinking that Neathia had started the war against Gundalia but, as the story progresses, the Brawlers realize that its actually the other way around. The stakes are high! Will the Battle Brawlers defeat the Twelve Orders, saving the Bakugan once more? Or will they lose this time?
Ren Krawler- The Gundalian Traitor. He started with the brawlers (really cheating for Gundalia), then back with the Gundalians, then recently, back with the Brawlers as a Castle Knight. He uses the Darkus attribute.
Queen Serena- The queen of Neathia, she is also Fabia's older sister. She doesn't battle but sends Fabia to get the brawlers and watches over the city. It is said on Teletoon that she is a main character.
Nurzak- The original Subterra member of the Twelve Orders who defected to join Neathia. After winning the war, Nurzak declares he will return to Gundalia to form a new government as well as forge only friendly relations with their neighbors, the Neathians.
Ren Krawler- The Gundalian Traitor. He started with the brawlers (really cheating for Gundalia), then back with the Gundalians, then recently, back with the Brawlers as a Castle Knight. A Gundalian who used to be a Darkus brawler for Gundalian Agents.
The only one of the six fighting Bakugan that appears is Drago.
Dharak and Drago are the only Bakugan that have evolved in this season.
This is the first season to not have a total of 52 episodes.
When the title screen came up in a few episodes, it switched the Subterra and Ventus symbols around.
Towards the end of Bakugan: Gundalian Invaders, the effects of abilites didn't seem to matter when the brawlers went to Neathia, except for the first few episodes; this trend was continued into Bakugan: Mechtanium Surge.
This season also marks the first time that Dan has had another Guardian Bakugan other than Drago (Dragonoid Colossus, and not including the time when he had to use Apollonir after Drago's capture).
Dan was also the only one of the Battle Brawlers to use the Mobile Assault Vehicles.
This is the first season that the main antagonists were all adults.
This is the only season without a masked brawler; Season 1 had Masquerade, Season 2 had Spectra Phantom, and Season 4 has Mag Mel and Wiseman.
It is the first season where the Japanese opening theme song is not performed by Psychic Lover.