Retro Studios struggled in its early years, dealing with several cancelled projects and lay-offs. In 2000, Nintendo offered the company the license to the long-dormant Metroid franchise which proved to be a turning point for the company. [Infos from Wikipedia]
One of the GameCube games that were cancelled to concentrate the team on the development of Metroid Prime, was this NFL Retro Football, that was basically a traditional football game with impressive graphic and animations for its time (and a rumored create-a-player mode).
What do you think about this unseen game? Give your vote!