9x02 official description
ABADDON RISES --- Dean (Jensen Ackles) shocks Sam (Jared Padalecki) by popping open the trunk of the Impala and showing him that he has kidnapped Crowley (Mark Sheppard). Kevin (guest star Osric Chau) freaks out when he sees the King of Hell, but Sam and Dean convince him that they need Crowley to find the demons on Earth. Meanwhile, Abaddon (guest star Alaina Huffman) re-emerges and plans to take over Hell. Guy Bee directed the episode written by Andrew Dabb (#901).
Source