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Credit for awesome summary Attack on Titan Season 4 Wikipedia.
The Scouts and Warriors land on Eren's rib cage, and incapacitate the Beast Titan realizing that it is just a shell with Zeke nowhere to be found.
Before Armin has a chance to transform, he is captured in a Titan's mouth.
Suddenly, countless versions of the Nine Titans of the past appear on Eren's back, created by Ymir Fritz to defend him.
Just as the Scouts and Warriors are nearly defeated, Annie and Gabi appear on the back of Falco's new flying Jaw Titan.
Meanwhile, Armin discovers Zeke in the Paths.