Subterra is an Attribute that symbolizes earth and rock.
Julie brawls with Subterra Bakugan. Her Guardian Bakugan in the Bakugan: Battle Brawlers TV series is a Subterra Hammer Gorem. Her boyfriend Billy also uses Subterra Bakugan, and his Guardian Bakugan is Cycloid. In the Bakugan: New Vestroia TV series, Mira also brawls with Subterra Bakugan. Her Guardian Bakugan is a Subterra Wilda. The Vexo Guss uses Subterra Bakugan, with a Subterra Vulcan as his Guardian Bakugan.