Four young men must be trained in the ancient art of spinjitzu by Sensei Wu in order to fight against the evil skeleton army and save the powerful four weapons; Hero rookie Rocka sets out to save the planet Quantros from the former Hero professor Aldous Witch, who has become the power mad Witch Doctor; Alpha team leader Storm is helped by team members Bulk and Stringer as he leads the Hero Factory and discovers that he is driven by something deeper within himself.