Attack on Titan Episode 20 English Dubbed Episode Title:Erwin Smith: The 57th Exterior Scouting Mission, Part 4.Episode Description:With the Female Titan restrained, Erwin and Levi try to ascertain her identity with no success as she is able to crystallize her skin to prevent them from cutting out the human inside. Armin, Jean and the rest of Levi's squad realize it was Erwin's plan to use Eren as bait to draw out the mole within the army who joined them after the Walls fell and only revealed his plan to those who were part of the Scout Regiment before the fall. Meanwhile, the others wonder what is happening inside the forest. Levi taunts the Female Titan, prompting her to give a loud scream that draws all Titans in the vicinity towards her. Despite the Scout Regiment's attempt to stop them, the Titans ignore the humans and eat the Female Titan's body in a frenzy which makes Erwin call off the expedition. However, with no confirmation that the mole has also been eaten by the Titans, Erwin orders Levi to regroup with his squad. Meanwhile, the mole, disguised as a cloaked Scout Regiment member, attacks Levi's squad and kills Günther.