Hulk: Gray is a comic book limited series written by Jeph Loeb and illustrated by Tim Sale. The series ran for a total of six issues which followed the early years of Bruce Banner and his problems as the Hulk. Jeph Loeb and Tim Sale also collaborated on other limited series such as: Spider-Man: Blue, Daredevil: Yellow, and Captain America: White. Each series, like Hulk: Gray, followed the early years of the different Marvel Comics heroes. Each series was highly praised.