<Tr> <Th> 20 </Th> <Td> </Td> <Td> "Totally Marble Nailed It" </Td> <Td> Michael Younesi </Td> <Td> Kathleen Fischer </Td> <Td> September 15, 2017 (2017 - 09 - 15) </Td> </Tr> <Tr> <Th> 21 </Th> <Td> 5 </Td> <Td> "Gray Goo on the Loose" </Td> <Td> Ken Friss </Td> <Td> Nat Bernstein & Mitchel Katlin </Td> <Td> September 15, 2017 (2017 - 09 - 15) </Td> </Tr> <P> The first season of the series, consisting of three episodes, was released on August 7, 2015 . On April 6, 2016, Netflix announced that the series has been renewed for its second and third seasons . The second season was released on August 12, 2016, and the third season was released on October 14, 2016 . Both consisted of six episodes . An extended 34 - minute Valentine's Day special was released as the first and only episode of the fourth season on February 14, 2017 . A fifth season consisting of five episodes was released on September 15, 2017 . The sixth season is scheduled to be released on November 7, 2017 . </P> <P> The series is filmed primarily in and around the San Fernando Valley area of Los Angeles, including Chatsworth, Woodland Hills, Van Nuys, and Northridge, as well as in Alhambra . </P>

When is part six of project mc2 coming out