The Hulk first appeared in The Incredible Hulk #1 (cover dated May 1962), written by writer-editor Stan Lee, penciled and co-plotted by Jack Kirby, and inked by Paul Reinman. Lee cites influence from Frankenstein and Dr. Jekyll and Mr. Hyde in the Hulk’s creation. The Hulk’s original series was canceled with issue #6 (March 1963).
In the debut, Lee chose gray for the Hulk because he wanted a color that did not suggest any particular ethnic group. Colorist Stan Goldberg, however, had problems with the gray coloring, resulting in different shades of grey, and even green, in the issue. After seeing the first published issue, Lee chose to change the skin color to green. Green was used in retellings of the origin, with even reprints of the original story being recolored for the next two decades, until The Incredible Hulk vol. 2, #302 (December 1984) reintroduced the gray Hulk in flashbacks set close to the origin story. Since then, reprints of the first issue have displayed the original gray coloring, with the fictional canon specifying that the Hulk’s skin had initially been grey. An exception is the early trade paperback, Origins of Marvel Comics, from 1974, which explains the difficulties in keeping the gray color consistent in a Stan Lee written prologue, and reprints the origin story keeping the gray coloration.
Lee gave the Hulk’s alter ego the alliterative name Bruce Banner because he found he had less difficulty remembering alliterative names. Despite this, in later stories he misremembered the character’s name and referred to him as “Bob Banner”, an error which readers quickly picked up on. The discrepancy was resolved by giving the character the official full name of Robert Bruce Banner.