The Decider is a 2001 American science fiction action film directed by Karl Christian, and starring Walker Bush, Mel Martinez, and Lan Chao. It is the second collaboration between Walker Bush and Karl Christian, and the first time Walker Bush starred in a dual role. Though it was released in January, typically a time for 'dumping' films considered otherwise unlikely to achieve commercial success,
The Decider was a financial success and received mixed-to-positive reviews from critics, spawning a number of sequels and reinvigorating Walker Bush's flagging career.
FBI Special Agent Dirk Hammer (Bush) has spent three years chasing down a serial killer in a truly bizarre case - each victim that is found dead can be matched to a still-living person, with no knowledge of their apparent twin. The case finally comes to a head when the latest victim proves to be the double of the Vice President of the United States. Hammer is brought in, however, because cutting-edge DNA analysis has marked him as the Vice President's killer, despite the fact that Hammer was thousands of miles away at the time of death. The national security implications of the case now established, Hammer is brought into a secret government operation by CIA Deputy Director Robert Church (Rob Bolton) - Project WONDERLAND, a naturally-manifesting dimensional phenomenon, linking to an alternate reality.
In the Wonderland reality, the United States has succumbed to a totalitarian regime ruled over by the President, an absolute dictator known as 'The Decider.' The CIA's top operative, Susan Park (Chao), informs Hammer the killer may be from this alternate reality, dumping his victims in ours to avoid detection. Hammer agrees to accompany her to the Wonderland reality's Washington DC to apprehend the killer, and they are transported there through a dimensional rift, to be retrieved in 48 hours. Things swiftly go awry when they are captured at a random security checkpoint by black-uniformed National Security Police. Park is able to bluff their way out of arrest and summary execution after convincing the NSP to scan Hammer's DNA, but refuses to explain to Hammer why this worked. Shortly thereafter, a city-wide security alert goes into effect and NSP Chief Marshal Keith (Southerland) launches a pursuit of the pair.
Hammer and Park reach the Wonderland-side address where the Vice President's body was found, finding a bombed-out slum district populated by social cast-offs and other undesirables of the new regime. Disgraced and blind ex-Congressman Jason Fox (Martinez) helps Hammer and Park avoid notice by a local gang by letting them into his derelict nuclear survival bunker, and tells them that the bodies of those eliminated by the government are often left scattered around the city, as a final insult and to further intimidate the populace. Fox fills them in on more of this history of Wonderland - a world-wide oil shortage sparked a global nuclear war, causing widespread famine and and devastation, weakening the United States to the point that a coup from within toppled the civilian government and instituted an absolute dictatorship, which invaded and annexed many of the remaining resource-rich countries. Southerland and the NSP attack the slum district, crushing the gangs' ineffectual resistance, and Fox sacrifices himself to buy time for Hammer and Park to escape into the disused DC Metro tunnels.
In the tunnels, they are about to be set upon by another gang, but when Hammer lights a magnesium flare to ignite a pool of leaking oil, his face is revealed, and the gang flees in terror. Taking refuge in a subway car refitted as an underground house, Hammer again presses Park for an explanation, but she deflects his inquiries with a romantic interlude. Southerland then floods the tunnels with water diverted from the Potomac, and they are forced to escape through a locked access shaft. They emerge into a secret train station built to evacuate government officials during the Cold War, and are captured by the Wonderland CIA Deputy Director, a heavily-scarred Robert Church (Bolton). Church finally reveals the truth to Hammer - his double in this reality is The Decider, and Church plans to use Hammer as his puppet to maintain order after assassinating the President. Park is revealed to have been a part of this plot from the beginning, delivering Hammer to Wonderland to gain favor with the new Church regime and establish peaceful relations between the two realities.
Left alone in a cell, Hammer is able to stage an escape with the aid of a carelessly-discarded knife and arrives in White House just in time to prevent the murder of his counterpart in a climactic cat-and-mouse gun-battle against Church's assassin, Linda Corvus (Meghan O'Sullivan). Hammer is able to defeat Corvus because she is the Wonderland version of a spree killer he arrested at the beginning of his FBI career, but this earns him no love from The Decider, who orders his execution when Southerland arrives to counter-act Church's attempted coup, and a battle breaks out between the NSP and CIA forces. Hammer and The Decider face off in a violent hand-to-hand martial arts battle, culminating on the roof of the now-burning White House. As a helicopter approaches, The Decider is trapped against the edge of the roof, and Hammer demands his surrender. The helicopter opens fire on them, revealing itself to be part of the CIA coup, and The Decider tells Hammer that they're dead either way, and makes the final decision - to go out on his own terms by leaping into the blazing inferno of the Rose Garden.
Hammer is able to leap aboard the helicopter when it makes a low pass over the roof, and overpower the crew, including Park. They swiftly reconcile when she expresses her love and reveals she left the knife in his cell, and they fly off to an uncertain future as the White House explodes behind them.