Face in the Clouds were really two blimps controlled by a mobster in Florida. One blimp projected a monster's face on the clouds, and a bellowing loudspeaker would threaten the people below.
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The second blimp would drift over the highways and lower a powerful magnet over cars, lifting them up from the ground and bring them to the gangster's hideout.
The Comet literally put a hole in the scheme, by piercing the blimps with his "eye beams."