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 losing their contact inside the government, Jackson (James Wolk) and his comrades have to use their own devices to combat a wave of animal assaults on Geneva, Switzerland. Peter Outerbridge guest stars with series regulars Alyssa Diaz and Kristen Connolly. 9 p.m. CBS
Containment After suffering a...