Ecurb Trebor Banner, known as the Kluh, is an intelligent incarnation of the Gray Hulk, a "superior" clone created by Xemnu in a failed attempt to destroy the Hulk and replace his very absence with Kluh. Kluh and Xemnu also had to fight Red Hulk up to the point where Impossible Man was watching the fight and used his magic to merge both Hulks into the Compound Hulk. Kluh was apparently killed by the Compound Hulk when this whole plan fell apart.