"That Day" is the 20th episode of the third season of Attack on Titan. Continuing further on Grisha's past from the previous episode, "That Day" uncovers the hidden fragments of Grisha's story that viewers never knew about.

This is the episode that cements Attack on Titan's position as a classic anime. It completely subverts the very genre that the show belongs to and brings a level of intrigue and lore that no one could have anticipated. It is the absolute peak of the show thus far, and will undoubtedly be a lesson for the history books on how to completely change the dynamics of a show and deliver on a long-awaited mystery.

A love-letter to the fans who have been inching every little clue to understand the bigger picture, it is nothing short of perfect.