The first hour of I Am Legend is an awesome story about Will Smith and his dog Sam tooling around an abandoned Manhattan in rad cars, hunting antelope and trapping vampires for medical experiments. The remainder is sub-28 Days Later "last best hope for humanity" melodramatic pap. Smith is the main attraction here, giving what is perhaps his best performance as a man constantly fending off the terror of being utterly alone in the world by thrusting himself into the futile labor of trying to find a cure for the disease that has turned the scintilla of humanity who didn't expire straight away into a horde of rabid zombie/vampires that prey on the even smaller scintilla who were entirely immune. Unfortunately the filmmakers, who invest a great deal of time building an engrossing atmosphere of isolation coupled with desperation, decide to sabotage their story with a particularly glaring deus ex machina, turning I Am Legend's climax into Panic Room: The Cliffs Notes. I suppose that insofar as Will Smith-starring adaptations of 1950s classic sci-fi novels, it's far better than the atrocious I, Robot.