Seven-year-old Martez Johnson got a special surprise birthday party from the hospital where his grandmother is undergoing cancer treatment.Martez spends a lot of time at the hospital, staying by his grandmother's side and helping keep her spirits up during her time of illness. Since his grandmother couldn't throw him a birthday party, the hospital decided to surprise him with cake, presents and a visit from Spider-Man.Watch the video above to see Martez's reaction to the surprise party.