She-Hulk was created by Stan Lee, who wrote only the first issue, and was the last character he created for Marvel Comics before his return to comics in 1992. She first appeared in Savage She-Hulk #1 (November 13, 1979).
She was created because Marvel was afraid that The Incredible Hulk TV show’s executives might suddenly introduce a female version of the Hulk, as had been done with The Six Million Dollar Man, so Marvel decided to publish their own version of such a character to make sure that if a similar one showed up in the TV series, Marvel would own the rights. Jennifer Walters, the cousin of Bruce Banner, is the small and somewhat shy daughter of Los Angeles County Sheriff William Morris Walters. Operatives of Nicholas Trask, a crime boss who had crossed paths with her father, shot and seriously wounded her on a day that Bruce Banner happened to be in town for a visit. Since no other donors with her blood type were available, Banner provided his own blood for a transfusion; as they already shared the same blood type and DNA, his radioactive blood, combined with her anger transformed Jennifer into the green-skinned She-Hulk when the mobsters tried to finish her off at the hospital. Walters still largely retaining her personality as She-Hulk; in particular she retains her intelligence and emotional control, though like Hulk, she still becomes stronger if enraged.