Underdog is an American animated television series that debuted October 3, 1964, on the NBC network under the primary sponsorship of General Mills, and continued in syndication until 1973 (although production of new episodes ceased in 1967), for a run of 124 episodes. Underdog, Shoeshine Boy's heroic alter ego, appears whenever love interest Sweet Polly Purebred is being victimized by such villains as Simon Bar Sinister or Riff Raff. Underdog nearly always speaks in rhyming couplets, as in 'There's no need to fear, Underdog is here!' His voice was supplied by Wally Cox.
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To install apps that are not from the Google Play Store; Android requires you to enable the (Unknown Sources Setting).
To enable the Unknown Sources setting:
Go to your Home screen and tap Settings. Select Security. You may need to scroll down to see the Unknown Sources setting, enable this setting then try installing the application again. For Android 8.0+, tap Settings, then tap Apps. Next search for the app you just downloaded and enable it to be installed. If you still have problems try searching online for how to turn on >>> (Enable Unknown Sources) for Android.