After learning that their island of Paradis is essentially a concentration camp for "Eldians" — a race of humans who are being oppressed for their inherent ability to transform into Titans — the Survey Corps plans to invade the outside world of Marley in order to obtain freedom. Three years later, Marleyan child soldiers Gabi Braun and Falco Grice prepare for combat under the watchful eye of Reiner Braun, a double agent between Marley and the Eldians suffering from the trauma of war.
As Marley tries to strengthen its tenuous political dominance with other nations, Eren and the Survey Corps invade Marley. After using their Titan powers to devastate their military forces, they escape back to their home of Paradis Island to recuperate. Meanwhile, a vengeful Gabi and worried Falco become stowaways on their ship. The Survey Corps cooperates with Zeke — a double agent for the Eldians and wielder of the Beast Titan's powers — in trying to build a new empire.
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But Eren himself has other plans. Years of warfare and the revelations of his lineage have worn away at him. After the attack on Marley, he was arrested for treachery after acting violently against their initial invasion plan. But an extremist faction of Eldians known as the Yeagerists break him out, believing him to be a savior of sorts. Seemingly working alongside the Yeagerists, Eren willfully cuts ties with his close friends Mikasa Ackerman and Armin Arlert.
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The Yeagerists assume control of the Paradis government and military in their efforts to initiate the Rumbling, the plan to unleash an army of Colossal Titans on a march to mow down the world. In conjunction, Zeke plans to use the power of the Founding Titan to sterilize the remaining Eldian population in order to prevent the births of new Titans and eventually eliminate the race entirely. Meanwhile, Falco and Gabi are caught in the middle as they begin to question their anti-Eldian sentiments.
The fourth season ends with Eren preparing to use his Attack Titan powers to take on a Marleyan ambush, with his rival Reiner leading the charge.
The second half of Attack on Titan: The Final Season will premiere on Jan. 10, 2022.
