Attack on Titan S01 E17 Female Titan: The 57th Exterior Scouting Mission (1)

"Home was a pen. Humanity, cattle."

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.