After viewing some of Hef's old videos, Crystal and the twins are eager to throw a retro-cool '70s-themed roller disco party at the Mansion. Since the girls are too young to know about that era, they enlist the help of Hef's former girlfriend Barbi Benton to help them plan the party. Of course, Barbi goes all out and even brings over some of her old '70s fashions for the girls to try on! It turns into a chance for Barbi to bond with Hef's three new ladies, and Barbi and her daughter even get in on the act when they all take private skating lessons from an eccentric instructor to help enhance their roller skills. But will the girls' party live up to the infamous parties of the past?