Realizing that he is getting older, Grampa decides to give his family their inheritance before they die. He takes them to the mall, where Lisa buys the new talking Malibu Stacey. However, she soon finds out that the speaks sexist phrases that demean women.
When her complaints go unnoticed, she tracks down Stacey Lovell, the original creator of the doll. However, on learning that she does not work for the company anymore, Lisa persuades Stacey to help he make their own talking doll, without stereotypes.
Meanwhile, Grampa takes a job a Krusty burger to go where the action is, but soon realizes that he belongs on the other side of the counter with the complaining pensioners. Lisa and Stacey create their doll, called "Lisa Lionheart," however they discover they cannot beat the big business of Malibu Stacey. When a little girl buys Lisa's doll, Lisa concludes that getting through to that one girl will all be worth it.