Egged on by Wendy, Stan and Kyle start building a tree-house in Stan's backyard with the goal of eventually being able to play Truth or Dare with Wendy and Bebe (who has developed a crush on Kyle). Jealous of Stan's tree-house, Cartman enlists Kenny's help in building an even bigger one of their own. Meanwhile, Stan's parents make a surprise announcement that they're getting a divorce, and Stan soon meets his new step-father, who immediately begins cracking the whip.