The show often featured cameo appearances by characters from other Marvel cartoons of the period. In the second season, the show's format, after UPN decided that Season 1 was too dark, was changed, and to give "female viewers a chance", the network ordered that She-Hulk be made a regular co-star. As a result, the series was officially renamed The Incredible Hulk and She-Hulk. The second season also featured the Grey Hulk.