The Flash - 'Flash vs. Arrow'

"You shot me!"
"I heard you heal fast."

In part one of a two part crossover that I will not be watching the conclusion to until I can get through the rest of Arrow Season 2, Oliver Queen and Team Arrow pay a call on Central City in search of Captain Boomerang (although they probably wouldn't call him that) and help out Barry while they're there. The Flash is up against Roy Bivolo (aka Prism, aka 'Rainbow Raider', a name which causes Cisco to place an embargo on Caitlin ever naming anyone again.) Bivolo is a metahuman with the ability to invoke outbursts of anger in others, using his power to create distractions for his crimes.

Oliver offers to help train Barry to use his powers with more precision, but learning that not only does Eddie think he is a public menace but that Oliver is on Iris's 'Three for Free' list rankles with Barry, and when Bivolo puts the whammy on him he goes after Eddie before the Arrow intervenes, leading to the titular smackdown, pitting Oliver's discipline and experience against Barry's powers.

The fight is the action centrepiece (afterwards, Bivolo's capture happens off-screen) and it does not disappoint. Leading up to it, the interplay between Teams Arrow and Flash are wonderfully realised, from Diggle's surprise at Barry's powers ("What? You didn't tell him about me?") to Olly's face-off with Dr Wells ("There's something off about that guy.") There is also a lot of character movement, with Iris turning against the Flash (understandably enough) after his attack on Eddie, and Oliver warns Barry that his relationship with Iris is doomed. ("Guys like us don't get the girl.")

We also have a reminder of Caitlin's dead fiance in time for him to show up living homeless and on fire (in a metahuman way) in the stinger.