The Red Wedding in Game of Thrones is a brutal massacre at a wedding feast, where Robb Stark, his mother Catelyn Stark, and many of his allies are killed after being invited as guests. It is one of the show’s most infamous twists and happens in the episode “The Rains of Castamere.”

What happened

At the Twins, the wedding of Edmure Tully and Roslin Frey is used as a trap. Robb Stark had broken a marriage pact with House Frey, and Lord Walder Frey uses the celebration to exact revenge, with support from House Lannister.

Why it matters

The scene is shocking because it breaks the rule of guest right and wipes out much of Robb Stark’s cause in one moment. It becomes a turning point in the story, changing the balance of power in the War of the Five Kings.

In one line

If you want the simplest version: the Red Wedding is the betrayal-and- massacre scene that destroys Robb Stark’s army and changes the whole story.

TL;DR: The Red Wedding is a planned betrayal during a wedding feast that ends with Robb Stark and many of his supporters being murdered.