Attack on Titan Episode 21 English Dubbed Episode Title:Crushing Blow: The 57th Exterior Scouting Mission, Part 5.Episode Description:Erwin tells Hange that it was a mistake to think all intelligent Titans are like Eren, since the Female Titan has unique abilities far beyond that of a novice. Elsewhere, the mole transforms into the Female Titan and chases after Levi's squad. Armin theorizes that the mole is someone who had seen Eren transform during the invasion of the Trost District. Eren wants to transform into a Titan, but the squad tells him to trust in their skills and keep moving forward. Eld, Oruo and Petra manage to blind the Female Titan and attempt to cut off her arms. However, the Female Titan quickly regenerates her right eye and kills the three. Seeing his comrades dead, a grieving Eren transforms into a Titan. Believing his comrades and squad's death could have been avoided if he had transformed in the first place, Eren fights the Female Titan in a long battle. The Female Titan finally defeats Eren by taking off his head and swallowing his human body. Mikasa attempts to stop the Female Titan, but to no avail. She is later joined by Levi, who tells her to keep their distance, as the Female Titan is getting tired.