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The cloudship of Dr. Phineus Phibes is a blimp that can generate its own cloud cover.
He stole it from another scientist and added his own inventions to it.
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He attempted to make himself the smartest being on the planet by releasing a "stupid" gas from his airship, but an accident set it off inside the ship, affecting all his surbordinates except for himself who had taken an overdose of a nano-tech formula which made him super intelligence, but a side-effect made his head grow to an enormous size. It's his giant head which kept the world below safe and also kept Phibes falling to the earth when he fell through a hole in the floor.