Board Thread:Questions and Answers/@comment-5071469-20130604094038/@comment-61022-20130613012224

See Incredible Hulk #296-300 the Hulk goes on a rampage across America injuring many people ending with Dr. Strange banishing the Hulk to the Crossroads dimension.

Then in Incredibly Hulk Vol 2 #88-91 the Hulk goes on a rampage through Las Vegas killing 26 people. That prompts the Illuminati to exile him to planet Scar, thus creating the chain of events of Planet Hulk, Wold War Hulk etc.

(As someone who has ready the Planet Hulk stuff didn't you wonder why the Illuminati would exile the Hulk to space?)