Dr. David Dibble have the ability to became the hulking creature know as the Behemoth, a quick to anger monster, member of the Retaliators, heroes from earth 8.
When the Gentry attacked his world, along with his teammates, Behemoth tried to stop it, but he suffered a defeats at the hands of Captain Carrot. His mind could not deal with the logic of cartoon physics.
He also had fought against the Extremists, when they destroyed and later resurrected their world.
His adventures are published in Major Comics, on Earth-36.
He died after found himself with a newfound intelligence.
Same as all the inhabitants of earth 8, Behemoth is an analog/homage character to Marvel Comics' Hulk.