What actress played a lead role in Grease 2?

these are just the main characters: john travolta-Danny zuko, Olivia newton john- sandy ollson, stockard channing-betty rizzo, Jeff conaway-kenickie, Micheal tucci-sonny, barry pearl-doody, kelly ward-putzie, Didi conn-frenchie, jamie donnelly-Jan, dinah manoff-Marty