May 11, 1965: Sam must don the robe of a Ku Klux Klansman in order to save the life of an ambitious young civil rights leader, who is trying to register black voters.

In a two-hour special, NOVA follows seven aspiring doctors through four years of medical school. The first examination, the anatomy lab, the first death, the first baby-it's all part of becoming a doctor. Neil Patrick Harris, star of ABC's Doogie Howser, MD hosts.

Jerry dog sits for a man he met on an airplane after the man has to go to the hospital and Jerry can't leave the apartment. Without Jerry, George and Elaine are forced to spend time alone and realize that it's not the same without Jerry. Meanwhile, Kramer tries to break up with his girlfriend.