CBS has ordered another season of “Zoo,” Variety has learned. Season 2 is slated to air in summer 2016.

The renewal comes as no surprise, as the freshman drama ranked as the most-watched new scripted series this past summer.

Based on James Patterson’s 2012 novel of the same name, “Zoo” is a thriller about the wave of violent animal attacks against humans across the planet.

“Zoo’s thrilling stories clicked with audiences each week during a very competitive summer,” said Glenn Geller, president of CBS Entertainment. “We’re excited for viewers to see where our talented writers and cast take them as the adventure continues to unfold during season two in the ultimate fight of man vs. beast.”

Starring James Wolk, Kristen Connolly, Nonso Anozie, Nora Arnezeder and Billy Burke, the CBS Television Studios production is exec produced by Patterson, Jeff Pinkner, Josh Appelbaum, Andre Nemec, Scott Rosenberg, Michael Katleman, James Mangold, Cathy Konrad, Bill Robinson, Leopoldo Gout and Steve Bowen.

CBS’s summer 2016 slate is already quickly filling up, even though the past season just came to a close. Along with Season 2 of “Zoo,” the network has greenlit new comic thriller “BrainDead” from “The Good Wife” creators Robert and Michelle King, which is set to premiere next summer, along with a new season of long-running hit “Big Brother.”

Still being discussed is Halle Berry’s “Extant,” which is awaiting a decision on a third season renewal. “Under the Dome,” based on Stephen King’s novel, wrapped its run with the series finale this September.

Amazon recently acquired the rights to “Extant,” “BrainDead” and already had “Under the Dome” streaming. “Zoo’s” first season is available on Netflix.

“Zoo” averaged a 1.6 rating in adults 18-49 and about 9 million viewers overall, according to Nielsen’s “live-plus 7” estimates. It ranked No. 2 among summer’s new scripted broadcast series in the demo and No. 1 in total viewers.