After watching a video of a Mansion roller disco party from 1979, the girls decide to hold their own roller disco party in that style. Looking for advice on what to wear, they first ask Norma of the Mansion staff, but Norma refers them to Barbi Benton instead. Barbi has saved her outfits from the 1970s and agrees to come to the Mansion to show them to the girls. Barbi arrives with her daughter Ariana and lots of clothes. They find that most of Barbi's outfits don't fit the twins, who are seven inches taller than Barbi. Barbi notes that she has seen many of Hef's girlfriends come and go over the years, and that the twins are younger than her daughter Ariana. Nevertheless, she and Ariana get along well with the girls. A skating instructor comes to show the girls some roller disco moves. The day of the party arrives, and the Mansion tennis court is filled with roller-skating, bikini-clad Playmates, friends, and Mansion habitués.