Tuesday's TV Highlights: 'Zoo' on CBS

Pretty Little Liars In an attempt to get Alison (Sasha Pieterse) out of the psychiatric hospital, the Liars commit a deadly mistake that changes everything. Troian Bellisario, Lucy Hale, Tyler Blackburn, Ian Harding, Ashley Benson and Shay Mitchell also star. 8 p.m. Freeform

Zoo After unexpectedly...