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.
Tad acts like the stereotypical rich antagonist from sports movies with few attitudes of dumb blonde stereotype, ripping on Stan endlessly, despite the fact that Stan is a little boy and has just begun learning to ski. Stan also outright admits that he couldn't beat Tad, but these admissions are overlooked by Tad as he continuously eggs Stan on to have a race with him.
During the race itself, he also uses numerous dirty tricks to secure his victory, such as throwing sand in Stan's path.