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Credit for summary Attack on Titan Season 4 Wikipedia.
Willy begins his theatrical presentation to the local and international audience while Eren, Reiner, and Falco listen in a basement below the stage. Willy tells the well-known story of Marley's hero Helos, who formed an alliance with the Tybur family to defeat the Eldian King Fritz, however he reveals Fritz and the Tyburs fabricated the myth themselves.
King Fritz actually wanted peace and willingly went to Paradis Island with the remaining Eldians, vowing to renounce war. His ideology was passed through his bloodline, which kept his successors bound to his desire for peace.
Meanwhile, Pieck and Porco are trapped by a Marley soldier in a small, stone-walled cellar which effectively prevents them from transforming into Titans.
Back in the basement, Eren reminds Reiner of their past as adversaries, but Eren explains that since his arrival in Marley he has realized that the two of them are alike, but with contrasting beliefs due to their different upbringings. They hear Willy announce above them that Eren is a threat to world peace as he is not of the Fritz family.
Just as Willy declares war on Paradis, Eren transforms into the Attack Titan and bursts out of the basement, throwing Willy into the air and positioning himself to consume the head of the Tybur family.
NOTE: This episode is from Volume 25 of the manga.