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Credit for awesome summary Attack on Titan Season 4 Wikipedia.
The freed Survey Corps decide to help Eren, though Mikasa expresses her doubts about Eren's motives. Meanwhile, the vicious battle of Eren against Reiner and Porco continues, with Eren slowly gaining the upper hand.
Suddenly, Zeke arrives as the Beast Titan on top of Wall Maria and begins to attack the Marleyan airships, soldiers, and warriors. The Survey Corps force the Jaegerists to free the jailed members of the Military Police and Garrison Regiment, including Commander Pyxis who offers to lead a group of soldiers who have drunk the wine tainted with Zeke's blood to fend off the invaders.
Nile reunites Falco with Gabi and Colt, and the three of them race to stop Zeke from screaming and turning Falco and the tainted soldiers into titans.
Pieck fakes the death of the Cart Titan enabling Magath to fire a shot at the Beast Titan's nape with the anti-Titan cannon, gravely wounding Zeke and causing him to fall from the wall into the city. As Eren limps towards the fallen Beast Titan, Reiner rushes to stop Eren from coming into contact with Zeke.
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NOTE: This episode is from the end of Volume 29 of the manga.
Also, when Gabi said "There were no devils on this Island...just humans", that was so touching and true. We are all humans no matter the race or religion. The only devils are those who are willing to sacrifice lives out of hatred or to gain land or power!