It seems that someone broke into Warner Brothers to steal the footage below. I seriously doubt that the studio would allow footage from both live-action Marvin the Martian and Hong Kong Phooey cartoons. Marvin seems to be more along the lines of a short that could play in front of a WB title like they did back in the day; but HKP is clearly voiced by Eddie Murphy and must just be too horrible to ever see the light of day, until now. Check out the video below to see what could have been!
Thanks to CartoonBrew for the footage!