Guest Stars Tyler Blackburn as Caleb Rivers Janel Parrish as Mona Vanderwaal Keegan Allen as Toby Cavanaugh Brendan Robinson as Lucas Gottesman Brant Daugherty as Noel Kahn Yani Gellman as Garrett Reynolds Shane Coffey as Holden Strauss Bahni Turpin as Crisis Center Manager Co Starring Anthony Tyler Quinn as Ron