Erwin Smith: The 57th Exterior Scouting Mission, Part 4

Irvin Smith is the twentieth episode of the Attack on Titan anime. It is produced by Wit Studio and Production I.G. In this episode, the soldiers of the Scouting Legion attempt to break through the Female Titan's defense in order to find out the identity of the person inside.

Short Summary
With the Female Titan restrained, Irvin Smith and Levi try to figure out its identity with no success as it is able to harden its skin to prevent them from cutting out the human inside. Jean, Armin, and the rest of Levi's squad realize it was Irvin's plan to use Eren as bait to draw out the mole within the Scouting Legion who joined them after the Walls fell and only told his real plan to those who were part of the Legion before the fall. Meanwhile, the others wonder about what is happening inside the forest until the Female Titan gives a loud scream that draws all Titans in the vicinity to her. Despite the Scouting Legion's attempt to stop them, the Titans ignore the humans and eat the Female Titan's body in a frenzy, which makes Irvin call off the expedition. However, knowing that there is no confirmation that the mole has also been eaten by the Titans, Irvin orders Levi to resupply while the mole, disguised as a cloaked Scouting Legion member, attacks Levi's Squad, killing Gunter Shulz.

Summary
Following the capture of the Female Titan, Eren questions its identity, wondering if it's an Abnormal or something like the Colossal Titan. Auruo and Petra interrupt his thinking and tell him to focus on getting farther in and standing by. Meanwhile, Levi readies himself to strike the Female Titan, however, Irvin isn't satisfied with just trapping the Female Titan and orders the soldiers to fire the rest of the wires.

At the outskirts of the forest, the soldiers continue making sure that no Titans get inside. Christa notices that one of the Titans begins climbing, but Nanaba doesn't seem to be worried at all. She also states that it shouldn't be long until Commander Irvin issues a withdrawal order. While Sasha and Mikasa wonder if it's the sound of cannons firing inside the forest, Ymir asks Bertholdt about Christa's whereabouts, but Bertholdt doesn't know. Jean and Armin are forced to shift positions as a Titan is beginning to climb farther into their position, noting that it's scary how they are able to learn. Afterwards, Jean shares his idea about what is going on inside the forest: He thinks that they lured the Female Titan into the forest in order to capture it.

Inside the forest, Eren also reaches similar conclusion, but wonders why is it that not even the elite soldiers knew about the plan. This angers Petra and Auruo as Eren implies that Irvin doesn't trust them. However, Erd agrees with Eren and concludes that it's because Irvin knew of a spy among the soldiers. He then assumes that the only soldiers aware of the plan were those who survived 5 years ago. They wonder if that spy was the one to kill Sawney and Bean, remembering the question Irvin asked everyone at that time, finally realizing its meaning. Eren ponders about Irvin's decision, knowing that too many soldiers died because of it. Erd asks him if he thinks that Irvin was wrong. At the same time, discussing the same issue, Armin tells Jean that Irvin simply made his choice - whether to sacrifice hundred of soldiers or all the people inside the walls. He states that only those who do not hesitate to make sacrifices are able to change something.

Meanwhile, Hanji continues taking advantage of the Female Titan's regenerative abilities in order to immobilize it. However, in spite of the Titan's restricted movements, Levi and Mike are unable to break through its hardened skin. Irvin notices an ability similar to that of the Armored Titan. He then decides to use explosives to blow up the target's wrists and orders the soldiers to ready them. At the same time, Levi lands on top of the Female Titan's head and sarcastically remarks that the person inside should just come out as they have no time to waste. He then begins threating the Titan, stating that there's no way of escape and also asking whether it is okay to cut off the hands and legs of the person inside. Hearing this, the Female Titan lets out a loud screech that can be heard all the way to the forest outskirts, much to everyone's surprise.

Still taken aback, the soldiers wonder if it was the Titan's dying scream, when Mike tells Irvin that he can smell Titans coming from every direction and the soldiers at the outskirts find themselves to be ignored by the Titans running into the forest. Sasha, however, tells Mikasa that she recognizes the noise - it's a scream of a cornered beast that has nothing to lose. She warns Mikasa to be extra cautious and Mikasa, knowing that Sasha's instincts are usually right, wonders about Eren's whereabouts.

Inside the forest, Irvin orders the soldiers to ready the explosives now, but they have no time as the first group of Titans reaches the Female Titan. Realizing that they're to devour the Female Titan, Irvin orders everyone to engage in combat with them. However, upon seeing the upper hand of the Titans, Irvin signals a retreat. Knowing that he understimated the enemy, Irvin then orders everyone to return into the formation. However, he has Levi to refill his gas and blades beforehand.

The soldiers at the forest outskirts then notice the retreat signal, happy to be finally able to return home. Gunter also sees it, letting the rest of the squad know that they're going back. Wondering if they can finally see the person inside the Female Titan, Eren is told by Petra that it's all thanks to him as he decided to have faith in them back then. Auruo then complains about Eren whining whole time, but Erd reveals to Eren that both Petra and Auruo peed their pants during their first expedition, much to their anger and Eren's surprise.

The group then notices a signal flare, thinking it was fired by Levi. However, upon witnessing their own signal flare, the mysterious person readies their blades and heads their direction. Meanwhile, Hanji asks Irvin about his decision to have Levi resupply, claiming there is no time for it. Irvin explains that while they saw the Female Titan being eaten, the person inside it wasn't seen. Deducing based on Hanji's previous hypothesis, Irvin states that there's a possibility that the culprit managed to escape using the attire of the Scouting Legion. At the same time, the person nears Eren and others. Just as Gunter notices that it's not Levi, he gets attacked and Eren witnesses now Gunter's corpse hung on the tree.

Episodio 20