The documentary series shows how the iconic trio shapes their reunion. How do they compile the setlist from an endless stream of hits? How much blood, sweat, and tears does it take to rehearse their signature dance moves? What does it feel like to sing together again for the first time in almost 20 years? And which outfits do Karen, Kristel, and Kathleen want to wear on stage? We follow the trio closely as they meticulously prepare for their massive party and gear up for a marathon of already legendary shows.