Humidor is one of the gang's mules in The Fourth Alarm!. Humidor pulls the third fire truck, the one driven by Johnny and Mary with the boiler and the very wobbly wheels. While throwing the chemicals and powder out of the chemist's lab, Farina rolls one of the cans down the stairs. The can rolls into the third fire truck and causes it to start on fire. Later, Humidor notices and runs off with the fire truck, causing the gang to chase after it.
Humidor was played by Dinah the Mule.