(Green Lantern III #30, 31, Flash II #69, 70) - Hammond began a long-distance chess game with Gorilla Grodd, who was incarcerated in a Gorilla City prison. The moves were actually a code to let Grodd know that Hammond had discovered that they both got their powers from the same type of meteor. Grodd also communicated that he had found a third evolutionary meteor on Earth and sent its location to Hammond. Hammond broke out of police custody, mentally controlled Flash III and forced him to run him to Gorilla City. Grodd and Hammond found the meteor, and each one planned to betray the other, but Grodd struck first, taking the power of the meteor and turning Hammond into a devolved Neanderthal man. Flash, Green Lantern and Rex the Wonder Dog stopped Grodd from taking over Gorilla City, and Detective Chimp subdued the savage Hammond. Hammond and Grodd, whose mind had been dampened, were put together in confinement in Gorilla City.

(Green Lantern 80-Page Giant #2)- Hammond drove a crowd of New Yorkers insane in an attempt to distract Green Lantern IV and put him under mental domination. Impulse pulled Lantern away from one of Hammond’s mind blasts, thus interrupting the process and inadvertently gaining temporary mental control of Lantern for himself. Lantern used his power ring to put Hammond in an emerald cell and kept him from concentrating and using his mental powers by blasting the Spice Girls over a gigantic stereo system.

(JLA #34) - Mageddon approached Earth, and sent a remote sender to Belle Reve prison, where it latched onto Hector Hammond and used his mental powers to drive the prisoners berserk with rage. Most of the JLA was occupied, but Plas, Green Lantern and Aquaman quelled the riot while Orion dispatched the remote sender.

(JSA #34, 35) - The Ultra-Humanite used Johnny Thunder’s Thunderbolt to conquer the world, and imprisoned Hector and virtually every superhuman on Earth. The Humanite mind-controlled Hector and a number of other telepaths, using them as his Mindsweepers so he could extend his mental domination over a greater number of superhumans. The JSA used a device that disrupted the braincaps Humanite used to control the Mindsweepers, freeing them from Humanite’s control.

(Green Lantern: Rebirth #1, 6) - Belle Reve; Hammond lacked brain activity but started instilling traumatic fear in guards and babbling to himself after Green Lantern Kyle Rayner returned to Earth with knowledge of Parallax’s imminent return. Hammond observed with interest while Hal Jordan was resurrected and Parallax was defeated.

(Green Lantern IV #4-6) - Belle Reve; Hector Hammond sensed the return of the Gremlins, aliens who liked to take things apart and put them back together again, aliens that were behind his creation. His mental powers were amplified, so he scrambled the minds of two guards, prompting Belle Reve officials to start constructing a new cell for him two hundred feet below the main facility. Hammond demanded to see Green lantern and projected a vision of the warden’s wife being gutted so he’d agree to fetch the hero. Hammond revealed the existence of the Gremlins to Hal, and warned him that they were in Coast City checking in on their other experiment, the Shark. Hammond missed being a moving, functioning man, and took Hal’s memories of a date with an attractive redhead as his payment. Hal only agreed to the dinner and drinks part of the date, and when Hammond tried to take more of his memories he reactivated Hammond’s pain centers and rendered him helpless. Hammond begged him not to leave, saying he wanted a real life, and that he wanted to be Green Lantern. The Gremlins checked in on Hammond, crawling all over his body, and he warned them that he’d alerted Green lantern to their presence, but they continued their experiments, altering his cerebral cortex so he’d be fit for sale as a weapon in an intergalactic war. Green Lantern defeated the Gremlins, and Hammond proclaimed him to be the greatest hero of all. Hammond was transferred to Edwards Air Force base, and was kept in Hangar 44, meant to house aliens and alien technology. The prisoner next to Hammond was a dismantled Manhunter, and Hammond confessed that the last surgery the Gremlins did on him changed everything.

(Villains United: Infinite Crisis Special #1) - The Society made plans for a worlwide prison break to free every incarcerated supervillain, and they cut the power of Hector Hammond's psi-inhibitors so he could escape from the Slab.

Comments: Created by Gil Kane & John Broome