Back at the firehouse, Smokey immediately starts a fire and struggles to convince Lt. McGinty (Spike Jones), who is busy leading band rehearsal that they must stop playing and put out the flames.

Bill Peters (Tom Brown) demonstrates his new mechanized fire-engine, and although it continually breaks down, he insists to Chief Rorty (George Cleveland) that his truck is the way of the future.

The squad immediately set to work on the new equipment, and although Smokey proves to be an inept fireman, he excels at Bill's tests because of his dedication to memorizing the manual.

When Harry later becomes trapped in his Murphy bed and his wife sounds an alarm, Firehouse 12 shows up wearing their silly band outfits, causing Spencer to suspend them all.

At Spencer's party, McGinty's band plays a number that includes a midget climbing out of the tuba and a grenade explosion.

Deducing the ruse, Smokey, Smitty and McGinty jump in the fire-engine and chase the hoodlums' car, followed closely by Emma and her bewildered new owner.