Now streaming on: The opening scenes of "I Am Legend" have special effects so good that they just about compensate for some later special effects that are dicey. We see Manhattan three years after a deadly virus has killed every healthy human on the island, except one. The streets are overgrown with weeds, cars are abandoned, the infrastructure is beginning to collapse. Down one street, a sports car races, driven by Robert Neville (Will Smith), who is trying to get a good shot at one of the deer roaming the city. He has worse luck than a lioness who competes with him.