Attack on Titan - Season 1 - Eps 17: Female Titan: The 57th Exterior Scouting Mission (1)
As the Recon Corps begins its push toward Shiganshina, they encounter an intelligent Female Titan unlike any they've seen before. When Armin hypothesizes that it's really a human that's been turned into a Titan, he, Jean, and Reiner attempt to stop it.
About Attack on Titan

Title: Attack on Titan
First Air Date: 2013-04-07
Last Air Date: 2022-04-04
Status: Ended
Rating: 8.7/10 (from 6669 votes)
Language: JA
Seasons: 5
Total Episodes: 87
Network: MBS NHK G Tokyo MX
Genres: Animation, Sci-Fi & Fantasy, Action & Adventure
Production Companies: Production I.G, MAPPA, WIT STUDIO, Pony Canyon, Techno Sound, Kodansha, dentsu, MBS, Pony Canyon Enterprise
Synopsis
Many years ago, the last remnants of humanity were forced to retreat behind the towering walls of a fortified city to escape the massive, man-eating Titans that roamed the land outside their fortress. Only the heroic members of the Scouting Legion dared to stray beyond the safety of the walls – but even those brave warriors seldom returned alive. Those within the city clung to the illusion of a peaceful existence until the day that dream was shattered, and their slim chance at survival was reduced to one horrifying choice: kill – or be devoured!
Cast

Yuki Kaji
Eren Yeager (voice)

Yui Ishikawa
Mikasa Ackerman (voice)

Marina Inoue
Armin Arlert (voice)

Kisho Taniyama
Jean Kirstein (voice)

Hiro Shimono
Connie Springer (voice)

Yoshimasa Hosoya
Reiner Braun (voice)

Takehito Koyasu
Zeke (voice)

Ayane Sakura
Gabi Braun (voice)

Natsuki Hanae
Falco Grice (voice)