In the latest promo for the upcoming "Arrow"/"Flash" crossover, which hails from New Zealand, Barry and Oliver are up against Vandal Savage (Casper Crump), his mystical abilities and... the cold? The trailer shows Barry and Oliver just can't quit the banter, even in the face of immortal terror.

Starring Grant Gustin, Carlos Valdes and Jesse L. Martin, "The Flash" airs Tuesdays at 8 pm EST on The CW. Starring Stephen Amell, David Ramsey and Emily Bett Rickards, "Arrow" airs Wednesdays at 8 pm EST on The CW. The crossover event airs Tuesday, December 1 and Wednesday, December 2.