"Kill or be killed," declares the final commercial for the Season 2 finale of The CW's "Arrow." But while the show's upcoming battle between the assembled forces of Oliver Queen and Deathstroke may well be its most epic to date, it's the promise of a first glimpse of "The Flash" in action that might be drawing viewers to Starling City Wednesday evening.

POLL: Which Character is Least Likely to Survive the "Arrow" Season 2 Finale?

"The Flash" features the Barry Allen version of the character from DC Comics, who was created by Robert Kanigher, John Broome and Carmine Infantino. "Arrow" executive producers Greg Berlanti and Andrew Kreisberg are at the helm of the series, and co-wrote the pilot script with DC chief creative officer Geoff Johns. It also stars Jesse L. Martin, Rick Cosnett, Danielle Panabaker, Candice Patton, Carlos Valdes, Tom Cavanaugh, John Wesley Shipp, Michelle Harrison and Patrick Sabongui.