Contains spoilers for this episode and earlier episodes.
Lannister soldiers kill the Stark household in King's Landing. Syrio holds off men sent to capture Arya, allowing her to escape; she kills a stableboy when he tries to stop her. Sansa is detained and persuaded to write to Robb asking him to submit to Joffrey. Robb calls the northern banners instead. Catelyn leaves the Vale after Lysa refuses aid, then joins her son's army as he plans his next move.
Tyrion buys safe passage from the mountain clans by promising weapons and takes them to Tywin's camp. Robb releases a captured Lannister scout with a deliberately misleading impression of his plans. At Castle Black, Jon is confined after attacking Thorne over an insult to Ned. That night, a dead ranger rises and attacks Jeor Mormont. Jon fights the corpse and burns it, saving the Lord Commander's life and exposing a threat within the castle.
Drogo's men raid a Lhazareen village, and Daenerys claims captive women to protect them from rape. Drogo kills Mago when the warrior challenges her, suffering a wound that Mirri Maz Duur offers to treat. In court, Joffrey replaces Barristan Selmy and rewards Janos Slynt for the City Watch's loyalty. Sansa kneels before the king and begs for Ned's life. Joffrey offers mercy if Ned confesses to treason and recognises his rule.