"Lisa's Date with Density" is the seventh episode of The Simpsons' eighth season. It originally aired on the Fox network in the United States on December 15, 1996. It was written by Mike Scully, and directed by Susie Dietter. It sees Lisa develop a crush on Nelson Muntz, which eventually leads to Lisa and Nelson dating. It also was among the first episodes to feature Milhouse's crush on Lisa, an element of the series (along with Lisa's vegetarianism) to have spun off from "Lisa's Wedding".