An adopted teenage boy, Eli, stumbles upon a high-tech gun at an abandoned warehouse where he was searching for scrap metal to sell. Fascinated by his discovery, he takes the weapon home, unaware of its origins and immense power. Meanwhile, Eli's life is disrupted when his older brother, Jimmy, is released from prison. Jimmy's attempt to pay off a debt to a local crime lord goes awry, leading to dire consequences for him and his estranged father.

Forced to flee, the brothers hit the road with Eli's new mysterious weapon in tow. Their journey is marked by a series of confrontations as they are chased by not only the vengeful crime lord's henchmen but also by a group of soldiers from another world. The brothers must navigate their troubled relationship while trying to uncover the true nature of Eli's find and survive the dangers that follow them.