Tad Mikowsky is the character Stan battles skiing in "Asspen". He often mockingly calls Stan Marsh "Stan Darsh".
Tad's father is a rich businessman who plans to bulldoze a small youth center in order to develop the area. If Stan wins the race, the youth center will be saved.
Although Tad appears to be winning the race at first, he ultimately loses when a girl flashes him her breasts - which turn out to be a pair of stranded alien "things". The distraction allows Stan to win, saving the youth center.