Doomship

Doomships are Koopa vessels, commonly used by Bowser and the Koopalings; they resemble pirate ships with large propellers that keep them sustained in the air, paving the way for flight-driven conquests. A doomship is regularly armed with several cannons which fire Bullet Bills, cannonballs, and Bob-ombs—some even being able to unleash fire, serving as rocket engines. After their initial use ("Super Mario Bros. 3") Bowser and his Koopa Clan now use Doomships more often, as they stage their many attacks on the Mushroom Kingdom. For instance, during the "Dimension" saga, Bowser provides several of his doomships as he and Doctor Eggman combine forces to defeat their enemies—though ultimately, they are defeated in the War Above Earth by the Star-Moon/Irken Armada.

One Doomship travels to the Earth's moon five years later, and its crew finds the arm of Gemerl the android. Presumably, the Doomship was destroyed when Gemerl reactivated and laid waste to the Valley of Bowser.