1977 Pontiac Phantom concept car, styled by Bill Mitchell, built on a Grand Prix chassis. As to the "why", Mitchell retired from GM in 1977, and left this car as a parting memorial to his love for the long, sleek, nostalgic and racy. He knew it was the (temporary) end of the road for his kind of car: “Realizing that with the energy crisis and other considerations, the glamor car would not be around for long. I wanted to leave a memory at General Motors of the kind of cars I love”.