Three troublesome dragons: Kaida, Darren, and Azina, are asked by Zeus to retrieve a special orb that Hades stole, and now it is guarded by him in the Underworld. The three so-called "best" dragons have no choice but to accept this mission. As the dragons travel through different areas, they face tough challenges that test their friendship and abilities. But will that be enough to defeat the God of the Underworld?