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{{nihongo|'''Serpillious'''|サーピリアス|Sāpiriasu}} is a wyvern-like [[Bakugan]] that debuts from the Reboot Series, debuting in ''[[Bakugan: Geogan Rising]]''. An independent [[Ventus#Reboot|Ventus]] Serpillious was seen in the ''[[Magnus' Journey]]'' episode of Season Three as the main antagonistic force.  Three variants of Serpillious also appeared in ''[[Bakugan: Evolutions]]'': an Elemental [[Darkus#Reboot|Darkus]] variant used by [[Chet Chipman]], a Ventus village {{nihongo|'''Elder'''|長老|Chōrō}} in Vestroia, and another Ventus variant by [[Sterling Glatman]].

Serpillious is a large imposing dragon-like Bakugan, with an aggressive look. Not only does he look the part, but this Bakugan has a real vicious attitude, and can hold his own against even the strongest opponent.<ref>[https://web.archive.org/web/20220127211045/https://bakugan.com/en/bakulog Bakugan.com Bakulog]</ref>

* Going by its code name, Serpillious seems to be partially inspired by the film representation of Smaug, a dragon seen in J. R. R. Tolkien’s Tolkien's “Middle Earth” Series.*Serpillious is the only ''Geogan Rising'' Bakugan Ultra in regular packs in ''Bakugan: Evolutions''.**It is not, however, the only ''Geogan Rising'' Ultra to have forms released in ''Bakugan: Evolutions'', with [[Demorc|Demorc Ultra]], [[Nillious (Generation 2)|Nillious Ultra]] and [[Sharktar|Sharktar Ultra]] receiving their Aquos, Ventus and Darkus forms respectively in the Baku-Tins as holdovers from ''Geogan Rising''.