Sellon is the tertiary antagonist from Bakugan Mechtanium Surge, she is an member of Team Sellon along with Team Anubias.
Sellon is an artificial Neathian just like Fabia Sheen who was the queen of Neathia, but unlike Fabia, Sellon is an villainess who has her true form of Neathian, she forced Shun to become the new leader of the Battle Brawlers.
Sellon enters in New Vestroia with her true form, she uses Iron Dragonoids, Flash Ingram, the Mechtogans to defeat Dan and Drago, but Dan and Drago manage to call Zenthon and Zenthon Titan to defeat both of all evil Bakugans.
Sellon later steal Dan's key for Mag Mel, but Mag Mel betrays her and absorbs her in the process in order to increase his power.
After Sellon's demise, the Team Sellon joins the brawlers.