The Brave and the Bold

"The Brave and the Bold" is the upcoming eighth episode of Arrow ' s third season and the fifty-fourth episode overall. The episode will act as a two-part crossover between The Flash and Arrow, along with the eighth episode of The Flash ' s first season,. It will air on December 3, 2014.

Synopsis
Oliver, Arsenal, and Diggle track down the location of a boomerang-wielding killer named Digger Harkness but are surprised when they come face to face with an A.R.G.U.S. team. Diggle asks Lyla why A.R.G.U.S. is involved but she defers until Harkness attacks the building, killing several agents and targeting Lyla. The Arrow joins the fight and gets help from an old friend – The Flash. Harkness manages to get away and Oliver teams up with Barry again to find him before he can get to Lyla. When Harkness plants five bombs in the city that are timed to explode at the same time, both teams must come together to save the city.

Production
Preparation began September 18 and wrapped up on September 26. Filming ran from September 29 until October 8.