Before he was an actor, Ken Jeong was an honest-to-goodness M.D. Now, in "Dr. Ken," the breakout comedy star of The Hangover movies and TV's "Community" brings medicine and laughter together as a grumpy and beleaguered HMO doctor whose challenging professional life is trumped only by his home life, in which his success as a husband and father is brought into question on a daily, if not hourly, basis.