 At a farewell party for shy librarian Sonja Mary feels sorry for her because nobody showed up and she invites her over to her place. Dick and Sonja talk all night about physics and when Mary has had enough of it and goes to bed, Dick goes to Sonja s place to continue the conversation and ends up sleeping there. Meanwhile, Tommy and Harry are writing an episode of The X-files and officer Don finds out why Sally is attracted to him.