Tom Cavanagh (Then)
As the laid-back older brother of J.D, Dan lived a very lack-luster life in his mother’s attic while working as a part-time bartender. He engaged in a brief fling with Elliot much to the annoyance of J.D who gave him some harsh advice regarding getting his life together. Cavanagh had previously starred in several television shows including “Love Monkey,” “Eli Stone” and “Trust Me.”