later gained the ability to transform into his version of Red Hulk form when in the Below-Place. Doc Green Convinced that unaided, the Banner, Green Hulk, and Grey Hulk identities would eventually destroy each other, Doc Samson uses hypnosis to merge the three to create a new single identity combining Banner's intelligence with the Grey Hulk's and Banner's attitudes and the Green Hulk's body. This new Merged Hulk, Professor Hulk, or simply The Professor, considered himself cured and began a new life, but the merger was not perfect, and the Hulk sometimes still considered Banner a separate person, and when overcome with rage the Merged Hulk would transform back into Banner's human body while still thinking himself the Hulk. The Merged Hulk is the largest of the three primary Hulk incarnations. While in a calm emotional state, the Merged Hulk is stronger than Savage Hulk when he is calm. Unlike the Savage Hulk and the Grey Hulk, Banner subconsciously installed a type of safeguard within this incarnation. The safeguard is that when the Merged Hulk gets angry, he regresses back to Banner with the mind of the Savage Hulk. Ultimately, of the Merged Hulk identity takes on the name 'Doc Green as the result of Extremis fixing Hulk's brain, becoming powerful enough to destroy Tony Stark's mansion with one thunderclap. The Devil/Immortal The Devil Hulk or Immortal Hulk, or simply the Devil or Immortal, is the result of the Hulk needing a father figure. While the character's physical appearance varies, he is always depicted as having glowing red eyes and reptilian traits. The new form of the Devil Hulk is the result of Banner and Hulk having been through different deaths and rebirths. This incarnation is articulate, smart, and cunning, and does merciless attacks on those who do harm. Unlike the other Hulk incarnations, the Devil Hulk is content with waiting inside Bruce. If Bruce is injured by sunset, the Devil Hulk will emerge with his transformation being limited to night-time. Thanks to the Devil Hulk side and Banner working together, the Devil Hulk can maintain his form in sunlight. Other identities The Gravage Hulk is the result of Banner using the Gamma Projector on himself which merged his Savage Hulk and Grey Hulk identities. This form possesses the raw power of the Savage Hulk and the cunning intellect of the Grey Hulk. While he does not draw on anger