The Brave and the Bold (Arrow)

"Well, sometimes they don't see it. There are people in the world who deal only in extremes-- And it would be naive to think that anything less than extreme measures will stop them. Sometimes bravery isn't enough. Sometimes the world requires us to be bold. Whatever the personal cost."

- Lyla Michaels to Oliver Queen

Synopsis
Oliver, Roy, 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.