Mechanical Dragon

The Mechanical Dragon is a giant metal dragon and a minor villain in the Aladdin television series, appearing only in the episode "Dune Quixote". His role in the movie is similiar to the other dragons's role in the fairytales, where he is guarding the princess, Sadira, and he is defeated later by the prince, Aladdin. He has participate in the villains wars, most notably in Disney Villains War - Part 3.

Defending The Underworld From An Old Friend
In this tournament, the beast serves as one of Queen Narissa's dragons forms, when the Archmage, the animated form of Master Xehanort, came into the Underworld, in purpose to free his old counterpart from his prison, and confronted the wicked queen. After a failed attempt to threw him into the Underworld, just like his previous self, the queen quickly changes herself into a new metal dragon form in order to deal with him, while the Archmage transformed himself into a giant sand-creature replica of him. While she deflects many attacks of the sorcerer and was ready to charge into him, the Archmage pushed her into a nearby cliff, smashing her whole body to that area, leaving only her metal head scattered in the Underworld.