The Climb

"The Climb" is the upcoming ninth episode, the mid-season finale of the third season of Arrow and the fifty-fifth episode overall. It will air on December 10, 2014.

Synopsis
Nyssa returns to Starling City and tells Oliver that her father, Ra's al Ghul has given Oliver 48 hours to find Sara’s killer or the The League of Assassins will start killing the citizens of Starling City. Laurel is stunned when her father delivers a very special Christmas gift – her mother, Dinah. Meanwhile, Ray tries to make amends with Felicity and Oliver sets a meeting with Ra’s al Ghul.

Production
Preparation began September 30 and wrapped up on October 8. Filming began October 9 and ran until October 21.