I can remember ITV's World of Sport featuring the film of this one Saturday afternoon way back in the 1970s. (For their 1pm pre-horseracing slot they usually covered offbeat "sporting" items including the Reno Air Races and the New York Firemen's Olympics.)
The daredevil's line was "I am the greatest superhero who has ever lived" and IIRC his exploits were done to benefit/inspire disadvantaged children.
I'd really love to see this clip turn up on one of the web videohosts.
Any chance, anyone?