From Cartoons to Crap: Underdog from Cartoon Hero2 on Vimeo.
I still believe this was a script for a subpar Krypto The Superdog movie reworked into a bad Underdog movie. I'll stick with the TV show and I want to see that comic they put out last year.
That "U" on the Cartoon Hero's shirt looks like a horseshoe. Pretty apt actually.