In 2000, Banner and the three Hulks (Savage Hulk, Grey Hulk, and the “Merged Hulk”, now considered a separate personality and referred to as the Professor) become able to mentally interact with one another, each personality taking over the shared body as Banner began to weaken due to his suffering from Lou Gehrig’s disease. During this, the four personalities (including Banner) confronted yet another submerged personality, a sadistic “Devil” intent on attacking the world and attempting to break out of Banner’s fracturing psyche, but the Devil was eventually locked away again when the Leader was able to devise a cure for the disease using genes taken from the corpse of Brian Banner. In 2005, it is revealed that the Nightmare has manipulated the Hulk for years, and it is implied that some or all of the Hulk’s adventures written by Bruce Jones may have been just an illusion.
In 2006, the Illuminati decide the Hulk is too dangerous to remain on Earth and send him away by rocket ship which crashes on Planet Sakaar ushering in the “Planet Hulk” storyline that saw the Hulk find allies in the Warbound, and marry alien queen Caiera, a relationship that was later revealed to have born him two sons: Skaar and Hiro-Kala. After the Illuminati’s ship explodes and kills Caiera, the Hulk returns to Earth with his superhero group Warbound and declares war on the planet in World War Hulk (2007). However, after learning that Miek, one of the Warbound, had actually been responsible for the destruction, the Hulk allows himself to be defeated, with Banner subsequently redeeming himself as a hero as he works with and against the new Red Hulk to defeat the new supervillain team the Intelligencia.
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