Spider Riders(2006)

Spider Riders is an animated series set in a hidden underground world where warriors ride giant spiders to defend their realm. Young Hunter Steel stumbles into this Inner World through an ancient pyramid while following clues from his grandfather's diary. There, he discovers that Oracle, the world's fairy guardian, has been stripped of her powers by Mantid, the ruthless leader of the Insecters—an army bent on conquest. Oracle believes Hunter is the prophesied savior who can restore peace. To succeed, Hunter must locate four sealed keys that will restore Oracle's abilities while battling the Insecters' forces. He bonds with Spider Shadow, a massive spider chosen by Oracle, and joins the Spider Riders in their desperate fight to save the Inner World from domination.