Lois Griffin reserved a day at the family entertainment center, Cheesie Charlie's for her youngest son Stewie, who will soon become a 1 year old, and sends her husband Peter along with her older son Chris to drop off the deposit check at Cheesie Charlie's. However, once they arrive, Peter manages to lose their reservation — a move Peter immediately realizes will upset Lois. Peter lies to Lois, claiming Cheesie Charlie's is an evil place, though Lois does not believe his story. However, she decides to trust Peter after he says he has already planned an extravagant party at home.
The Griffins' daughter Meg has been having trouble making friends and fitting in at school. She soon meets and befriends a girl named Jennifer. Soon Meg is invited to a party by Jennifer, but Lois does not give her permission as the party is the same day as Stewie's birthday party. Meanwhile, Stewie misinterprets the meaning of his birthday and assumes that the same mysterious "Man in White" who delivered him as an infant will be returning to force Stewie back into the womb. Stewie decides to travel to Nicaragua to hire mercenaries to help him fight back against the Man in White. He makes it to the airport before deciding that he should face the "Man in White" on his own after all.
Peter fails to put together a party in time for Stewie's birthday, finally rerouting a circus parade into the Griffins' backyard, saving the day—that is, until he reveals to Lois that he gave Meg permission to go to a party at her friend's house. Peter goes to retrieve Meg from the party, where Meg is oblivious to the fact that the "party" is a cult meeting where the members will commitmass suicide by drinking poisoned punch. The cult leader meets Meg and she is almost ready to drink the poison. But Peter soon arrives and delivers a heart-warming speech to Meg and invites other members of the cult to Stewie's party; they all (except for the cult leader) agree and have a toast; Jennifer and the rest of the cult members do and they die immediately. but Peter and Meg leave before they have a chance to drink it. The cult leader notices that Meg did not kill herself with the punch and has left, so he puts on his white robe and follows them to the Griffins' house. Peter and Meg race back to the party just in time for the erotic cake Peter bought. Meanwhile, Stewie traps and kills the cult leader, thinking he is the "Man in White". The episode ends with Stewie making his birthday wish. He firstly thinks of bombs dropping but changes his mind and wishes everyone in disco outfits dancing.