The series continued the concept of a shared Marvel Animated Universe with numerous episodes featuring 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",[2] 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.