Which TV show had the most shocking plot twist?

[Zelda]

"Game of Thrones" shocked audiences with the Red Wedding, an event that saw several major characters brutally killed off in a single scene. The suddenness and brutality of the massacre left viewers stunned and forever changed the landscape of the show, solidifying its reputation for unpredictable storytelling.

[George]

The revelation of Jon Snow's true parentage in "Game of Thrones" is also a game-changing plot twist that reshapes the narrative and characters' motivations. Learning that he is the legitimate son of Rhaegar Targaryen and Lyanna Stark adds new layers of complexity to Jon's identity and his claim to the Iron Throne, setting the stage for the series' climactic conclusion.