Scott Adkins is the reliable, taciturn star of low-budget action flicks that Steven Seagal still thinks he is. The man is a legit martial artist. He looks tough, yet smart enough to be the hero of any sort of action flick he's offered, whether grounded in kick-boxing, organized crime or, as here, soldiering. Adkins leads a S. E. A. L. team deployed to a black-site island prison to transport a suspected terrorist to Washington ASAP. He supposedly knows what's needed to prevent an imminent nuclear attack in a major American city. His crew brings a civilian agent (Ashley Greene) to try to coax the intel from the detainee, since a period of "extreme interrogation" failed. The guy running the place (Ryan Phillipe) resents the hell out of this insulting intrusion on his domain and resists the extraction order, despite the claimed urgency and scale of the threat.
Horrible timing. Before they can leave, a horde of heavily-armed, disciplined terrorists crashes the party (literally and figuratively), killing the guards, destroying the means of exit, and cutting off communications before reinforcements could be summoned. They want the same inmate for whatever their end-game may be, regardless of the body count on either side.
What follows is a long, large-scale shootout between a horde of bad guys, amplified by the other prisoners they set free, and a greatly outnumbered and outgunned cluster of Adkins-led defenders. The clash plays out somewhat like a video game through the large, maze-like complex, both indoors and out, racking up a massive body count of anonymous characters, plus casualties among those we know by name and care about.
Adkins does what Adkins does as convincingly as ever. I started this review by calling him reliable for a reason. His brand of predictable is a significant asset, not a critique. The dude delivers exactly what his fans expect of him, which is largely a high score on the adrenaline scale that minimizes cerebral exertion. Here's a satisfying example for your guilty-pleasure enjoyment.