A chap returns home after going AWOL from the army and, in need of money, agrees to work for his cousin's small-time criminal team.
Recently they stole some vials of some kinda magic science potion that essentially turns people into a fleshy Terminator. Wounds instantly heal and that sorta stuff. Anyway, the shady boffins who invented this unlikely potion have decided they want it back and they should murderkill all the thieves.
A bit like that shit Bourne film, the one with the rumpled-face fella who isn't Matt Damon, but in many ways better as that film was bumwash compared to the other three. Haven't seen the new Bourne film yet, but I really hope it isn't shite.