What do you get when you cross Droopy with Columbo? You get Mumbly, a canine sleuth who joined ABC's Saturday lineup in 1976 as part of the Tom & Jerry Show.
Lt. Mumbly (Don Messick, of course) was a satire of Columbo, who by then was well established at NBC, and would later move to ABC himself a number of years later. Mumbly's superior officer, Inspector Schnooker (John Stephenson doing his Joe Flynn mimic) was designed as a parody of another popular 70's cop, Kojak, as if you couldn't tell with the color coordinated wardrobe. On his own, chasing a suspect, Mumbly, much like Droopy, would inexplicably appear here, there, & everywhere, frustrating his quarry to the point where he'd inevitably surrender on his own.
It would later be revealed that Mumbly was, in fact, a cousin to Dick Dastardly's sidekick, Muttley. As we've documented previously, a squabble over rights to Dastardly & Muttley between Hanna-Barbera & Heatter-Quigley (which co-produced Wacky Races) led to Dastardly & Muttley being sidelined for a few years, although that didn't stop Marvel from having them meet their kinfolk (Dread Baron being Dastardly's brother) in the pages of a Laff-A-Lympics. This meant Mumbly was recast as a villain for the Laff-a-Lympics series, and he hasn't yet reclaimed his badge, an oversight that has yet to be addressed!
Cartoonsintros provides the open:
As you can tell, they simply altered the lyrics to the theme from the Tom & Jerry Show, from which this was spun off.