Attack on Titan: S1 E20 - Erwin Smith: The 57th Exterior Scouting Mission (4)

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1x1
To You, in 2000 Years: The Fall of Shiganshina (1) (1x1)
1x2
That Day: The Fall of Shiganshina (2) (1x2)
1x3
A Dim Light Amid Despair: Humanity's Comeback (1) (1x3)
1x4
The Night of the Closing Ceremony: Humanity's Comeback (2) (1x4)
1x5
First Battle: The Struggle for Trost (1) (1x5)
1x6
The World the Girl Saw: The Struggle for Trost (2) (1x6)
1x7
Small Blade: The Struggle for Trost (3) (1x7)
1x8
I Can Hear His Heartbeat: The Struggle for Trost (4) (1x8)
1x9
Whereabouts of His Left Arm: The Struggle for Trost (5) (1x9)
1x10
Response: The Struggle for Trost (6) (1x10)
1x11
Idol: The Struggle for Trost (7) (1x11)
1x12
Wound: The Struggle for Trost (8) (1x12)
1x13
Primal Desire: The Struggle for Trost (9) (1x13)
1x14
Can't Look Into His Eyes Yet: Eve of the Counterattack (1) (1x14)
1x15
Special Operations Squad: Eve of the Counterattack (2) (1x15)
1x16
What Needs to be Done Now: Eve of the Counterattack (3) (1x16)
1x17
Female Titan: The 57th Exterior Scouting Mission (1) (1x17)
1x18
Forest of Giant Trees: The 57th Exterior Scouting Mission (2) (1x18)
1x19
Bite: The 57th Exterior Scouting Mission (3) (1x19)
1x20
Erwin Smith: The 57th Exterior Scouting Mission (4) (1x20)
1x21
Crushing Blow: The 57th Exterior Scouting Mission (5) (1x21)
1x22
The Defeated: The 57th Exterior Scouting Mission (6) (1x22)
1x23
Smile: Assault on Stohess (1) (1x23)
1x24
Mercy: Assault on Stohess (2) (1x24)
1x25
Wall: Assault on Stohess (3) (1x25)

Attack on Titan Season 1 Episode 20