Gargoyle (Marvel Animated)
Gargoyle was the Leader's chief assistant, a Russian scientist mutated by gamma radiation into a hideous creature. Gargoyle's loyalty to the Leader was strained at best, and he constantly desired a cure for his condition.
In one attempt to restore his original form, he created a gamma virus in a mine near Chicago. Although his form was temporarily restored, he reverted back to his hideous shape after being cured of the lethal virus.
As far as is known, Gargoyle never escaped from his servitude to the Leader.