Johnson made several changes from the comic book; this was partly to translate it into a live-action show that was more believable and acceptable to a wide audience, and also because he disliked comics and thus felt it best that the show was as different from the source material as possible. In the character's origin story, rather than being exposed to gamma rays during a botched atomic testing explosion, Banner is gamma-irradiated in a more low-key laboratory mishap during a test on himself. Another change was Banner's occupation, from physicist to medical researcher/physician. Although the comic book Hulk's degree of speaking ability has varied over the years, the television Hulk did not speak at all—he merely growled and roared. Hulk co-creator Stan Lee later recounted, "When we started the television show, Ken said to me, 'You know, Stan, I don't think the Hulk should talk.' The minute he said it, I knew he was right. the comics, I had the Hulk talking like this: 'Hulk crush! Hulk get him!' I could get away with it in a comic, but that would have sounded so silly if he spoke that way in a television show."