The first comic book issue of Marvel Comics' muscular, green superhero was published on this day, May 10 in 1962. A look at some interesting trivia about of one of Marvel's iconic characters on this occasion...

>> Hulk was coloured gray in the debut comic, as comic book writer Stan Lee wanted a color that did not suggest any particular ethnic group. Lee chose to change the skin color to green as colorist Stan Goldberg was having problems with the gray coloring, resulting in different shades of grey, and even green in the final output.