CBS has ordered a third season of drama series Zoo to air in summer 2017.

Zoo was the only CBS summer scripted series from last year to return. It is down in the ratings from its freshman run but remains the strongest scripted performer on the network, easily topping newcomers BrainDead and American Gothic, whose future is uncertain.

CBS’ summer scripted series are all owned by CBS and have streaming deals, making them financially advantageous even at modest broadcast ratings levels. Zoo‘s deal is with Netflix. While Live+same day is not a very reliable indicator, Zoo most recently drew 4.4 million viewers and 0.9 rating in adults 18-49 while American Gothic did 2.5 million and 0.5 and BrainDead 1.7 million and 0.3.

The two-hour second season finale of Zoo airs September 6.

Zoo is the second CBS summer series to be renewed for next year, joining reality staple Big Brother, renewed for two more seasons.

Based on the bestseller by James Patterson, Zoo chronicles a wave of violent animal attacks against humans across the planet. Zoo is produced by CBS Television Studios, distributed domestically by CBS Television Distribution and worldwide by CBS Studios International. Jeff Pinkner, Josh Appelbaum, Andre Nemec, Scott Rosenberg, Michael Katleman, James Mangold, Cathy Konrad, James Patterson, Bill Robinson, Leopoldo Gout and Steve Bowen are executive producers.