FX has renewed “The Strain” for season 2, FX announced Tuesday. The 13-episode second season will debut in summer 2015.

“We’ve never had any doubts about ‘The Strain,'” said John Landgraf, CEO of FX Networks and FX Productions. “Working with Guillermo del Toro, Carlton Cuse, and the brilliant cast led by Corey Stoll has been everything we had hoped it would be and more. It is thrilling when you have a show that is a creative and commercial hit, which is a rare accomplishment in this increasingly crowded marketplace. We look forward having it on FX for as long as Carlton, Guillermo and Chuck Hogan need to tell this epic tale.”

“The Strain” is the No. 1 new series on cable in the adults 18-49 demo, and FX’s first attempt to air an original series during Sunday’s crowded primetime lineup. The show also touts the most-watched series premiere in FX history with 12.7 million total viewers, and is the first drama series produced solely by FX Prods.

“I am thrilled! Another season to spread the virus!” said del Toro, who directed the pilot and co-wrote the best-selling books the series is based on, along with Chuck Hogan. “Working with Carlton, Chuck and FX has been immensely rewarding and we have such sights to unveil in the upcoming episodes — the blood hits the fan on this one, mankind becomes an endangered species.”

“I am grateful for all the blood, sweat and tears (but mostly blood) given to the project by all involved, and I could not be more excited to continue telling this epic story,” Cuse said.

The series stars Stoll, David Bradley, Mia Maestro, Sean Astin, Kevin Durand, Natalie Brown, Jonathan Hyde, Richard Sammel, Jack Kesy, Ben Hyland and Miguel Gomez. Cuse serves as executive producer, showrunner and writer. Del Toro serves as exec producer and director, Hogan serves as exec producer and writer and Gary Ungar also executive produces.

Del Toro and Cuse are represented by WME.

“The Strain” airs Sundays at 10 p.m. on FX.