Jaime's storyline in the first season remains, for the most part, identical to his book storyline, with only minor details altered. Introduced in the pilot, "Winter is Coming", Jaime is established as queen Cersei Lannister's brother and a knight of King Robert Baratheon's Kingsguard. After being discovered by Brandon Stark to be having an affair with Cersei, Jaime pushes the boy to his presumed death, only for Bran to survive the fall, admittedly with life-changing injuries and little recollection of the event. As the season continues, Cersei expresses her concern to Jaime that Bran will one day remember being pushed and expose their incestuous affair, which has spawned all three of Cersei's children. Jaime soon joins his father Tywin Lannister in the field as they face off against Robb Stark's army following the imprisonment of Ned Stark in King's Landing. At the Battle of Whispering Wood, Robb captures Jaime from the Lannister forces and uses him as a hostage. In the aftermath of Jaime's capture, he confesses to Catelyn that he tried to kill Bran, but refuses to reveal why.