The evil Beastwoman uses her multifrequency Beastwhistle to call all the animals in the Big city Zoo to break out of their cages and drive the people out. Dog Wonder finds Beastwoman in a dog parlor where he gets a poodle chip. D.W. succumbs to the Beastwhistle and, following Beastwoman's commands, captures The Blue Falcon and puts him in a maneating plant. Beastwoman orders her subjects to spread her fast growing seeds across Big City, which she plans to convert into a giant jungle!

B.F. manages to release himself and reprogram Dog Wonder so he won't obey Beastwoman's Beastwhistle. B.W., meanwhile, employs some bird to seed the clouds and have them rain on the seeded Big City, turning it into a jungle. The Daring Duo learn she plans to do this to the rest of the U.S.A. via rocket power, so Blue Falcon detains Beastwoman whilst Dynomutt goes up with the rocket which crashes into the lake and D.W. becomes a moss-covered mechanical mutt. Blue Falcon severs Beastwoman's powers by snipping her veins, and Big City is restored to normal. Blue Falcon attempts to shear Dynomutt's veins, but the latter decides to shake them off by dancing the Hula.

As Dynomutt escapes, Blue Falcon becomes Blue Blob. Dog Wonder races his blue buddy to The Falcon's Lair, where he sculpts him back to normal and spritzes him with The Falcon Instant Hardening Spray, and corner The Glob and his minions just as they nab the true Baltese Falcon. They capture Norbert Prindle in a huge goblet, and turn the crooks in and return the Falcon to the Crowne Art Gallery. Later, in the Falcon's Lair, D.W. tries to sculpt a ""Bluetese Falcon"", using B.F. for a model, but his creation shatters to pieces before he gets to profit big from it.

The Daring Duo are on the trail of Madame Ape Face who has swiped the face of Sophia Florenzi and plans tosteal all of the beautiful faces of the starlets of Big City. They catch up with The Madame at GaGa Galore's costume party but her face is stolen. Chasing Ape Face , Blue Falcon and Dog Wonder find themselves headed down a conveyor belt into a cold cream machine!

Saved by The Falcon Fan Snapper, The Daring Duo rush to the aid of the most probable victims. When Fifi Foray wins a beauty contest, Dog Wonder disguises himself as Fifi, and an ensuing scuffle with Madame Ape Face results in D.W.'s face stolen. (Dynoape, Ape Wonder?! It'll never be the same!) Using The Dyno-Radar Hand Detector, the heroes find The Madame's lair and Dog Wonder's face is restored. They catch Ape Face in the act of pilfering Sarah Showerfaucet's face at her apartment. Blue Falcon captures The Madame just as she tosses Sarah's face out the window, but Dog Wonder manages to catch it before it shatters on the concrete below.

Lurking in Big City is The Shadowman, who mysteriously knows all of the plans of The Crime Commission. The Daring Duo are called in when the 700-karat Shmope Diamond is swiped. As they respoind, they spot a shadow sneaking off with plates for new $20 bills stolen from an armored car. The Shadowman later manages to kill two birds with one stone by making off with a secret gold shipment and framing Mayor Gaunt (who is captured in The Dyno Bad Guy Box) all in one shot.

Mayor Gaunt swears his innocence so Blue Falcon and Dog Wonder inspect other members of the Crime Commission. At the District Attorney's home, The Shadowman straps The Daring Duo to a giant loaf of bread and sends them down a conveyor belt to their doom in a giant breadcutter. Dynomutt inflates the bread so it is too big to fit in the slicer and they escape to The Falcon's Lair, where Dynomutt restores both him and B.F. with his Dyno Paint Kit. Then they disguise themselves as The Panhandle Brothers unveiling a solid gold oil well used as a lure to trap The Shadowman, which is a success He is revealed by his own insidious Shadow-Box device to be Harold Twitch, the corrupt Crime Consultant himself. The Daring Duo return the stolen valuables, Mayor Gaunt is proven innocent, and Big City is once again safe