Wealthy merchant Cyrus Gold was murdered, and disposed of, but his body was revived fifty years later. Lacking any memory, Gold went to a hobo camp, and, when asked his name, said that all he remembered is that he was born on a Monday. They brought up the "Solomon Grundy" nursery rhyme, and he took the name. As a zombie, he cannot be killed easily, and he has enhanced strength and resistance to heat and cold. While typically neutral, he has been an enemy of Batman and Superman.