The studio was Total Television Productions.  They produced:

Underdog
Tennesee Tuxedo and his Tales
King Leonardo and His Short Subjects
The Beagles

King Leonardo was the oldest show, starting in 1960, featuring King Leonardo, ruler of Bongo Congo, aided by skunk Odie Cologne, usually trying to defeat the criminal schemes of Biggie Rat.  The show also featured the cartoons The Hunter (about an inept detective, always chasing The Fox), and Tooter Turtle (a hapless turtle, sent to various times and places by a wizard).  The show apepared on NBCon some of the earliest Saturday morning programming.

Tennessee Tuxedo and his Tales started in 1963, on CBS, featuring the penguin Tennessee Tuxedo and his walrus pal, Chumley, residents at the Megapolis Zoo (run by Stanley Livingston).  They have various adventures that usually hit a snag and they have to escape from the zoo to see Prof Phineas J Whoopee, a brilliant man who helps explain concepts and inventions to them, using his 3-Dimensional Blackboard (the 3-D BB).  They still usually screw it up because they don't listen to Mr Whoopie's caution about some element of risk.  Don Adams voice Tennessee, while Bradley Bolke voiced Chumley and Larry Storch voiced Mr Whoopie.

Also featured on the show were the cartoons The World of Commander McBragg (featuring the improbable adventures of the titular hero, based visually on British actor C Aubrey Smith, of The Prisoner of Zenda and The Four Feathers, with McBragg mimicking his handlebar mustache and heavy eyebrows, as well as his voice) and Klondike Kat, a hapless mountie (Klondike Kat always gets his mouse!), who is always after the criminal rat, Savoir Faire (Savoir-Faire is everywhere!).

Underdog was the most popular, appearing in 1964, on CBS, about the superhero and his girlfriend, reporter Sweet Polly Purebread.  He is secretly humble, loveable Shoeshine Boy, who opens a secret compartment in his ring and takes a vitamin pill, transforming him into Underdog, fighting the forces of evil, like mad scientist Simon Bar Sinister and Riff Raff.  Also featured on the show was the cartoon The Go-Go Gophers, about Native American gophers, who put one over on the Colonel Kit Coyote and Sergeant Okey Homa.  The Colonel was inspired, visually, by Teddy Roosevelt and the Sergeant was based on John Wayne.

I saw these shows in syndication, weekday mornings, as a young child, in the very early 70s.  Underdog and Tennessee Tuxedo were usually combined as a one hour block, mixing in the other cartoons.  Later, we got King Leonardo in afternoon syndication.  The cartoons were also sold as part of a package with Bullwinkle and Dudley Doo-Right.

In the 90s, Nickelodeon picked up Underdog, but edited out scenes of Shoeshine Boy taking his vitamin pill, which was stupid, because they make it clear it is a vitamin pill.

Underdog was great adventure; but I kind of preferred Tennessee Tuxedo (for one thing, his adventures weren't serialized across episodes, like Underdog), as they were funny and you learned stuff, via the 3D BB and Mr Whoopie.  Then, you watched Tennessee and Chumley try to apply the lesson.  With a science teacher father, that kind of thing was right up my alley, as he used to show my siblings and eye how to build stuff lie that.

We also used to get the Cambria Studios adventure show, Space Angel, one of their Synchro-Vox cartoons, which were largely still images with human mouths superimposed on the faces, to deliver dialogue (with Clutch Cargo and Captain Fathom also featuring that), with Commander Scott McCloud, agent of the Earth Bureau of Investigations and the Interplanetary Space Force.  His crewmates on the Star Duster were Taurus (the engineer) and Crystal Mace, daughter of a scientist who aided them.  Alex Toth did design work and direction on the series, before working for Hana-Barbera.

The other show of theirs that we had, in syndication packages, was The New 3 Stooges, with animated cartoon adventures featuring Moe, Larry and Curly Joe, with the Stooges in live action bookend segments, and the cartoon adventures in between.  The Stooges ended up suing the production company over undelivered financial statements about the earnings, which were supposed to be shared with the actors.  They lost an initial judgement, thanks to a judge unfamiliar with Hollywood accounting.  They won on appeal, in 1975, but Moe and Larry had already passed away.

So, that was my childhood, in the 70s, with those shows on local tv, weekday mornings, and the usual Hana-Barbera, Filmation and Rankin-Bass cartoons and Krofft Brothers shows on Saturday mornings (and Looney Tunes and Tom & Jerry).  The cartoons were interrupted by the Watergate Hearings and the station never brought them back, afterward, which ticked my off and I blame for making me cynical about politics.

Shouldn't have interrupted Space Angel and Underdog!

and Space Angel....

Get Smart played pretty regularly in syndication where I grew up.  So I watched it quite a bit as a kid.  That first season with a ton of input from Mel Brooks and Buck Henry is absolute comedy gold.  

Watched about four or five episodes of Rocky & Bullwinkle last night off of my Complete Series dvd, polished off the Upsidaisium arc (Bullwinkle's Uncle passes away and leave him a mine full of this material that constantly floats upwards. Of course Boris and Natasha are interested in it, because, why not?)

There were also very funny and very cute segments from Fractured Fairy Tales and Aesop & Son, Snow White INC. and The Cat & Fifteen Mice (which I actually had on an old R&B VHS tape from back in the day)