The second season, which was initially announced in November 2014, was originally planned for 2016.
The first 25-episode season aired from April-September 2013. Both Funimation and Crunchyroll streamed the first season as it aired in Japan, and Funimation released the series on home video in 2014. The first season also inspired two compilation anime films in 2014 and 2015.
Hajime Isayama‘s original manga has also inspired numerous spinoff manga, several novel series, a two-part live-action film project, a spinoff live-action television series, and an OVA. Two of the spinoff manga — Attack on Titan: No Regrets and Attack on Titan: Junior High — received anime adaptations of their own.