3. Hulk Squared
He is lived to be one the strongest incarnations of Bruce, even more than Green Scar. This big change in personality happened when Bruce and the R.O.B traveled back in time to fight with Chronarchists. In between, they had to travel back to the origin of Bruce. During the fight, Bruce double-radiated by Gamma Radiation, so R.O.B assisted him by downloading his mind to make him alive.
4. Compound Hulk
Compound Hulk was the fusion of Hulk and Red Hulk by Impossible Man’s magic. The main motive behind this fusion was to fight Xemnu and Kluh. After both were defeated by Compound Hulk, Impossible Man separated them.
