Given the high esteem people have for Steve Ditko's work of the era--the praise for Spider-Man and Doctor Strange--I've always been surprised that nobody ever seems to talk about...
When the Hulk was cancelled initially after only 6 issues, he was relegated to some guest-star appearances, mainly in Avengers and Fantastic Four.
But when he was given his own strip again, in Tales To Astonish #60, it was Dtiko, not Jack Kirby who had the art honors.
Anyway, Ditko was Ditko, he was around for some of the most important early issues of one of Marvel's most important characters...Yet nobody seem to remember his run on the Hulk.
From Tales To Astonish #60-67 (1964-1965)