Starman (of 1951)
During 1951 Ted Knight, the Golden Age Starman, was recovering from his nervous breakdown and was unable to defend Opal City. Suddenly, a new masked Starman stepped in to defend the city. This Starman flew around the city in a star-shaped craft and fought crime with power blasts and super-strength. At the end of 1951, the new Starman disappeared as mysteriously as he appeared.
There's a lot more to the story, but I strongly recommmend that you read the James Robinson "Starman" series to find out. Go find your spoilers somewhere else.