The Ad Council produced many a memorable PSA ad in the 70's. One of the coolest was a feature with a anti-littering superhero, Captain Cleanup. Mrmoore1970 uploaded this 11 second version, taken from the RetroJunk site:
Unfortunately, in the transition, the picture quality isn't as good as it should be.
Edit, 3/1/16: As you can see, we've filled in the blank.