Seth Green joins the voice cast in the third season as Leonardo.

Nickelodeon wants more Teenage Mutant Ninja Turtles.

The kids' cable network has renewed the CG-animated series for a 20-episode fourth season, which is slated for a fall 2015 debut, The Hollywood Reporter has learned.

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Seth Green (Robot Chicken) has also joined the voice cast of Teenage Mutant Ninja Turtles in the role of Leonardo for the third season, which kicks off this fall, replacing Orange Is the New Black's Jason Biggs.

Green joins a cast that includes Sean Astin (Raphael), Rob Paulsen (Donatello), Greg Cipes (Michelangelo), Mae Whitman (April O'Neil), Hoon Lee (Master Splinter), Kevin Michael Richardson (Shredder), Josh Peck (Casey Jones) and Corey Feldman (Slash).

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“Teenage Mutant Ninja Turtles has been a global hit, maintaining impressive numbers across the network’s ratings and our digital and consumer products platforms,” said Russell Hicks, president of content development and production at Nickelodeon. “While new episodes will continue to debut on Nickelodeon, we look forward to propelling the momentum with a fourth season for our loyal fans.”

Ciro Nieli executive produces the series, which premiered September 2012 to 12 million viewers in its premiere weekend. Teenage Mutant Ninja Turtles is currently wrapping its second season, which ends later this summer.

The news comes at an opportune time for the Teenage Mutant Ninja Turtles franchise, as Paramount readies the Aug. 8 opening of the Michael Bay-produced live-action feature starring Megan Fox and Will Arnett. It was directed by Jonathan Liebesman and written by Josh Appelbaum, Andre Nemec and Evan Daugherty.

Email: Philiana.Ng@THR.com

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