Henrik Fisker, the storied car designer who has shaped Aston Martins, Fords and BMWs, told the Reuters Autos Summit this week that he now wants a starring role in the green revolution.

But he also wants to make the world safe for sports cars for generations to come.

“Being a car enthusiast and loving cars, to be quite honest, I could not imagine a life without a beautiful, fast sports car,” Fisker said. “I needed to do something to make sure that I could drive one of those nice cars, my children could drive one of those beautiful, fast cars.”

So what was Fisker’s inspiration? What was the epiphany when he realized that the world was ready for the upcoming Fisker Karma, a $90,000 plug-in hybrid with 50 miles of all-electric fun?

Leonardo DiCaprio…in a Prius.

“A couple of years ago it started, by people who were maybe a little ahead of their time. You saw some movie starts like Leonardo DiCaprio buying a Prius.

“He could have bought any car in the world, and I remember seeing that on television and thinking to myself, you know, when you’ve got a guy who could buy any Ferrari or Rolls Royce and he’s buying a Prius, you know something is changing dramatically.”

(Henrik Fisker photo by Rebecca Cook of Reuters; Leonardo DiCaprio photo by Mario Anzuoni of Reuters.)

When it comes to competition in the auto business, it's the unknown that keeps the top U.S. Honda executive, John Mendel, up at night.

Mendel, speaking to the Reuters Auto Summit in Detroit, said he is always concerned about the conventional competitors. But what he is really afraid of is a company that "changes the game."

"What keeps me up regarding new competition is someone significantly changing the game," Mendel said.

People mention an autoseller taking up dealers dropped by General Motors, Chrysler or Saturn.

"What if they didn't have a dealer network," Mendel said. "What if they used big-box retailers and contracted with Jiffy Lube to have your car fixed?

"That could be a really new metric, which suddenly changes the whole cost structure for distribution significantly," said the Honda executive.

That has been tried before, by Sears, in the 1950s, but was killed by the complex state franchise laws that protect dealership networks.

Would such an idea work if tried by the Walmarts or the Costcos of the world? Should the U.S. state franchise laws be changed to allow it?

Mendel was a featured guest at this year's Reuters Autos Summit, which runs through Thursday in Paris and Detroit.