Contains spoilers for this episode and earlier episodes.
Catelyn bargains with Walder Frey for passage across the Twins. Robb must promise to marry one of Frey's daughters, and Arya is included in the marriage terms. Robb divides his army, sending a smaller force against Tywin while moving against Jaime. Tyrion is knocked unconscious before he can fight in Tywin's battle. Robb's other force defeats Jaime's army and brings him back as a prisoner, giving the Starks a valuable captive.
Jeor Mormont gives Jon the Valyrian steel sword Longclaw for saving his life. Maester Aemon reveals his Targaryen birth while urging Jon to consider his duty to the Watch. Farther east, Drogo collapses as his wound worsens. Daenerys permits Mirri to attempt blood magic despite the warnings of Drogo's men. Jorah kills Qotho during the confrontation. When Daenerys goes into labour, Jorah carries her into the tent where Mirri is performing the ritual.
Varys persuades Ned to confess by making him consider Sansa's safety. Before the crowd at the Great Sept, Ned falsely admits treason and calls Joffrey the rightful king. He notices Arya near the statue of Baelor and alerts Yoren. Joffrey then rejects the promised mercy and orders Ilyn Payne to execute Ned. Cersei and Sansa protest, but the order stands. Yoren grabs Arya and keeps her from watching as Ned is beheaded.