21. Suzanne Farrell
Showcase Episode: "The Gypsy and the Hobo"
Don has a torrid affair with Sally's schoolteacher, because of course he does. Unlike most of the lost strays he links up with, Suzanne can keep up with him crazy-wise, because she's as profoundly fucked up as he is — a long-distance runner who waits all night outside Don's house, in his car, until she realizes he's not coming back for her.