Dr. Seuss On The Loose was the 3rd special based on Seuss' (Ted Geisel) works produced by DePatie-Freleng for CBS, after The Cat in the Hat (1971) & The Lorax (1972). Your host for the evening is the aforementioned Cat (Allan Sherman, in his final performance for DFE), who introduces adaptations of three Seuss short stories:
The Zax, with all the voices performed by Hans Conreid, who starred in a live-action adaptation of Seuss' 5000 Fingers of Dr. T some years earlier; The Sneetches; & Green Eggs & Ham, whose lead character, Sam I Am, is voiced by Paul Winchell. Bob Holt, who starred in The Lorax, handles the rest of the voice work. Green Eggs & Ham was famously parodied by Johnny Bravo in season 1 of his series, in the episode, "Cookie Crisis", 24 years later.
Now, let's scope out Dr. Seuss On The Loose:
Delightfully silly. As you can tell, Universal owns the video rights.