After a long week of school, The Backyard Gang decide to have a sleepover at cousin Jimmy's house, they start talking about imagination and all of the fun they can have with it at the party. Just then, Barney comes to life, appearing to the kids. However, the kids are so busy that they don't recognize him. Barney taps them on the shoulders, when all of them get scared of each other. Barney asks the children what are they doing with all the sleeping bags. Which Tina replies to that they're having a slumber party. Barney, not knowing what a sleepover is, asks about what things they do at a slumber party. The children then reply all at once saying many different things. Barney calms them down. Barney asks them again, and the gang talks about playing games, singing, et cetera. The kids define a slumber party even more by showing Barney what they do at a slumber party, all through the evening and night, they play games, sing songs, and have so much fun!