The Pikes Peak International Hillclimb has been run 98 times. Someone named Unser has won overall on 26 separate occasions. Few of those wins are more memorable than 1986, the year all-time win record holder Bobby Unser came out of retirement, seventeen years after his last overall win, with the sole goal of setting a record time in an Audi Quattro. Being Bobby Unser, he accomplished his goal.
This 1986 video, shared on the official Pikes Peak International Hillclimb YouTube page, documents the event. It begins with him narrating the long history of the race itself, played over historic clips of the glory days of a hillclimb once dominated by the same sort of open wheeled racers that went to Indianapolis. Then, Unser explains, the era of rally cars at the hillclimb led to Audi’s entrance with their all-wheel drive Quattros, and in 1985 Michele Mouton brought the company its first of what would be three overall wins and then-world records. This was enough to entice him back to the event in one of their upgraded Quattro SLs, and the rest is history. For the full story and video, check out this article from Road & Track.