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 grey Hulk in flashbacks set close to the origin story. An exception is the early trade paperback, Origins of Marvel Comics, from 1974, which explains the difficulties in keeping the grey color consistent in a Stan Lee-written prologue, and reprints the origin story keeping the grey coloration. Since December 1984, reprints of the first issue have displayed the original grey coloring, with the fictional canon specifying that the Hulk's skin had initially been grey. 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 "Robert Bruce Banner." The Hulk got his name from a comic book character named The Heap who was a large green swamp monster. Series history The Hulk's original series was canceled with issue #6 (March 1963). Lee had written each story, with Kirby penciling the first five issues and Steve Ditko penciling and inking the sixth. The character immediately guest-starred in The Fantastic Four #12 (March 1963), and months later became a founding member of the superhero team the Avengers, appearing in the first two issues of the team's eponymous series (Sept. and Nov. 1963), and returning as an antagonist in issue #3 and as an ally in #5 (Jan.–May 1964). He then guest-starred in Fantastic Four #25–26 (April–May 1964), which revealed Banner's full name as Robert Bruce Banner, and The Amazing Spider-Man #14 (July 1964). Around this time, co-creator Kirby received a letter from a college dormitory stating the Hulk had been chosen as its official mascot. Kirby and Lee realized their character had found an audience in college-age readers. A year and a half after The Incredible Hulk was canceled, the Hulk became one of two features in Tales to Astonish, beginning in issue #60 (Oct. 1964). This new Hulk feature was initially scripted by Lee, with pencils by Steve Ditko and inks by George Roussos. Other artists later in this run included Jack Kirby (#68–87,