Calvin sees Mom with her hair wrapped in a towel. He says since she showered now, she and Dad must be going out. He also notices that he wasn't asked to clean up, so that means he's staying home. Since he's staying home, that means Mom has gotten a baby sitter. With a gasp, he realizes that means Mom probably hired Rosalyn! Mom confirms his fears by saying "Brilliant, Holmes". Calvin yells in horror.

Calvin asks Dad where they're going that night. He wonders why he and Hobbes can't come along. Dad says they're going to dinner and a movie to get some time by themselves. Calvin says that he could come. Hobbes wouldn't kill anyone. Calvin asks why they can't come, why aren't they wanted around. He asks if the movie's dirty or something. Dad tells Mom that they'll have a dinner with real pauses in the conversation. Can she imagine?

Calvin yells in anguish throughout the entire strip. Mom tries to explain to Calvin that she knows he doesn't like Rosalyn, but she's the only person they could get. Mom reminds Calvin she wants him on his best behavior. She tells him to do whatever Rosalyn says to, because she doesn't want to hear any horror stories when they return. Mom tells Calvin to take a breath before he passes out on the floor.

Calvin tells Hobbes not to guard Rosalyn. He wants to hit her with the balloon. Calvin says he'll just have to soak both of them. Rosalyn touches Calvin with the flag. She says the baby sitter flag means he has to obey the baby sitter. She says it's a half hour past his bedtime. They have to go in. Calvin grumbles about the darn baby sitter flag.