The fourth season of Teenage Mutant Ninja Turtles began airing on Nickelodeon on October 25, 2015. The season was ordered on June 17, 2014. The four final episodes originally aired in South Korea during mid- and late-December 2016. This is the only season of the series that has aired over traditional two standard TV seasons, as well as the only season of the series where the 2-part finale aired in separate weeks.