The Wolf and the Lion
Game of Thrones Season 1 Episode 5 (05/15/11)
Catelyn and her captor, Tyrion are attacked on the road to Lysa's. Tyrion saves Catelyn's life.
Rather than be a part of King Robert's desire to kill the Targaryen children, he resigns as Hand of the King. Robert calls him a traitor.
Word reaches King's Landing the Tyrion has been captured by Catelyn, and Ned pays dearly as a result.
Arya overhears some of the council men discussing Ned's inquiries into Robert's bastards and suggest he would be better off dead.
Catelyn is greeted by Lysa under bizarre circumstances.
Tyrion is sent to the dungeon, which consists of unique cells, dug into the side of the high mountian on which Lysa lives.