Guest Stars Tyler Blackburn as Caleb Rivers Janel Parrish as Mona Vanderwaal Keegan Allen as Toby Cavanaugh Tammin Sursok as Jenna Marshall Lindsey Shaw as Paige McCullers Torrey DeVitto as Melissa Hastings Brendan Robinson as Lucas Gottesman Nia Peeples as Pam Fields Annabeth Gish as Dr. Anne Sullivan