Title: Attack on Titan (TV series)
Content:  A second season of the anime series was announced on the opening day of the first theatrical film, which was originally set to be released in 2016. It was then confirmed in the January 2017 issue of the Bessatsu Shōnen Magazine that the second season would premiere in April 2017. Masashi Koizuka directed the second season, with Araki acting as chief director. It ran for 12 episodes from April 1, 2017, to June 17, 2017, on MBS and other television networks. A third compilation film recapping the events of the anime series' second season titled was released on January 13, 2018. 
Title: List of Attack on Titan episodes
Content:  Attack on Titan (進撃の巨人) is a Japanese dark fantasy and post-apocalyptic anime TV series adapted from the manga of the same name by Hajime Isayama. It is set in a world where humanity lives inside cities surrounded by enormous walls due to the Titans, gigantic humanoid beings who devour humans seemingly without reason. The story follows the adventures of Eren Yeager, his friends Mikasa Ackerman and Armin Arlert, whose lives are changed forever after a Colossal Titan breaches the wall of their home town. Vowing revenge and to reclaim the world from the Titans, Eren and his friends join the Scout Regiment, an elite group of soldiers who fight Titans. The fourth and final season premiered on December 7, 2020.
Title: Attack on Titan (TV series)
Content:  In the second season, the Survey Corps reel from the aftermath of battle and discover treachery from within, leading them to uncover some of the mysteries of the Titans.
Title: Attack on Titan (TV series)
Content:  season premiere was simulcast on Funimation, Crunchyroll, and the former's VRV channel at 10:30 AM EST. Funimation and Crunchyroll streamed the entire second season on their respective websites, while Adult Swim's Toonami aired a dubbed version. It was also announced that the second season of Attack on Titan would premiere on Toonami on April 29. It was subsequently announced on April 3 that the second season would premiere one week earlier, on April 22 instead. Madman Entertainment streamed the season in Australia and New Zealand on AnimeLab. Season 2 home media release was handled by Sony Pictures in the UK.
Title: Attack on Titan
Content:  September 2013, followed by a 12-episode second season broadcast from April to June 2017. A 22-episode third season was broadcast in two parts, with the first 12 episodes airing from July to October 2018 and the last 10 episodes airing from April to July 2019. A fourth and final season premiered in December 2020, airing 16 episodes in its first part, with the remainder announced to begin airing in January 2022. Attack on Titan has become a critical and commercial success. , the manga has over 100million tankōbon copies in print worldwide, making it one of the best-selling manga series of all time. It has won several awards, including the Kodansha Manga Award, the Attilio Micheluzzi Award, and the Harvey Award.
Title: Attack on Titan (TV series)
Content:  the wall of their hometown, Titans destroy the city and kill Eren's mother. Vowing revenge, Eren joins the elite Survey Corps, a group of soldiers who fight against Titans. Attack on Titan chronicles Eren's journey with the Survey Corps as they fight against the Titans while investigating their origin and history. Attack on Titan has received widespread acclaim and has notably sustained a broad, active and international fan base. Critics and audiences have praised the story, characters, animation, music, voice acting, and dark themes. The second part of the final season is scheduled to begin airing on January 10, 2022
Title: List of Attack on Titan characters
Content: Episode 1: ; Episode 2: ; Episode 3: ; Episode 4: ; Episode 5: ; Episode 6: ; Episode 7: ; Episode 8: ; Episode 9: ; Episode 14: ; Episode 15: ; Episode 19: ; Episode 20: ; Episode 21: ; Episode 23: ; Episode 24: ; Episode 25: 
Title: Attack on Titan (season 2)
Content:  The second season of the Attack on Titan anime television series was produced by IG Port's Wit Studio, chief directed by Tetsurō Araki and directed by Masashi Koizuka, with Yasuko Kobayashi handling series composition and Kyōji Asano providing character designs. It covers the "Clash of the Titans" arc (chapters 35–50) from the original manga by Hajime Isayama. It was broadcast on MBS TV from April 1 to June 17, 2017, and later aired on Tokyo MX, FBS, TOS, HTB, TV Aichi and BS11. Funimation and Crunchyroll streamed the second season on their respective websites, while Adult Swim aired Funimation's English dubbed version. The season 
Title: Attack on Titan (video game)
Content:  A sequel, Attack on Titan 2, was announced in August 2017 and was released in March 2018.
Title: Attack on Titan (TV series)
Content:  on Tuesdays, in Japanese with English subtitles, with the first episode having aired on September 30. The first season was acquired for distribution in the UK by Manga Entertainment. Madman Entertainment acquired the show for distribution in Australia and New Zealand, and streamed the series on Madman Screening Room. The final episode was also aired in Japanese theaters. The anime was compiled into two animated theatrical films with new voice acting from the same cast. The first film covers the first 13 episodes and was released on November 22, 2014, while the second film  adapts the remaining episodes and adds new opening and ending footage. It was released on June 27, 2015. A rebroadcast of the first season was aired from January 9, 2016 on NHK's BS Premium channel. The compilation films were also broadcast in January 2017 on MBS.

Question: season 2 attack on titan how many episodes?
Answer: 12.