Attack on Titan

Season 1, Episode 17

Episode Title: Female Titan: The 57th Exterior Scouting Mission (1)

Air Date: 2013-08-04

Overview:

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.