Guest Stars Janel Parrish as Mona Vanderwaal Keegan Allen as Toby Cavanaugh Torrey DeVitto as Melissa Hastings Nia Peeples as Pam Fields Brant Daugherty as Noel Kahn Ryan Merriman as Ian Eric Steinberg as Colonel Fields April Grace as Agent Cooper Samantha Cutaran as Naomi Helen Slayton-Hughes as Mrs. Potter Ryan Meyers as Riley Co Starring Julianna Rose as Student