Honestly, other than the classic WB shorts, Underdog was one of the apexes of cartoons. Great animation, hell no. One formula, hell yes. But it was good stuff. Good villains. Simon Bar Sinister, take off on Lionel Barrymore. Riff Raff, take off on George Raft. Pain in the ass heroine, Sweet Polly Purebread. And the imperfect hero. Humble lovable Shoe Shine Boy becomes Underdog. I LOVED how Underdog always talked in rhymes. My all time favorite was when he wrecked something important. "I am a hero who cannot fail. I can't be bothered with such details". The show ran a four part serial, two book end parts per half hour show. Then cartoon filler. They were a mixed bag. Commander McBragg and Tennessee Tuxedo were cool. Go Go Gophers (bet you will never see that on TV anymore) and Tooter Turtle stunk. And a cool theme
As a kid, I loved Underdog-best superhero character ever, especially since it poked fun at the superhero persona (which can't be done anymore; today's superhero fans are a humorless, easily offended bunch). Wally Cox was the voice of Underdog, and the theme song was great. I never watched a similar superhero cartoon, Courageous Cat and Minute Mouse, although I remember tuning in at the beginning just to hear the cool, jazzy theme song.