Who's This? A big head.
The facts: Created by John Broome and Gil Kane, this brainy, psionic villain first appeared in Green Lantern #5 (Marc-April 1961). In addition to many entanglements with various GLs over the years, he's also gone up against the entire Justice League of America several times. Following the restoration of the multiverse in Dark Nights: Death Metal, Hammond is restored to his human form (his head was getting really, REALLY big) and joins the Department of Extranormal Operations.
How you could have heard of him: He was the main villain in the live action Green Lantern movie, as played by Peter Sarsgaard! No? Oh well.
Example story: Green Lantern #157 (October 1982) "There's No Grave Like Home" by Mike W. Barr, Keith Pollard and Mike DeCarlo
Hal Jordan is out in space, heading for his "asteroid bungalow", but yikes, it's grown what I can only describe as a vagina dentata. Hal is forced to destroy his home and furniture (it attacks, too), and then the entire asteroid, which is animating as a rock giant.
Hal detects energies he can track back to a certain someone (you know who, if you've been paying even a gluon of attention), but those energies knock him out before he complete his identification. But we follow it back to Hector Hammond's cell (surprise!). Quick origin:
He's not destroying GL's asteroid home as simple revenge. Its core is similar to the meteor that super-evolved Hammond, and could restore his mobility. And indeed, it does. Try not to fall forward, my man.
You tell me if Hammond is creepier when he's completely immobile, but I tend to think so. And that getting into the action physically is not going to go well for him. He warps to Green Lantern's location, hoping to catch him in a weakened state, but Hal seems fine. Perhaps a few solar fragments will change that.
You know, according to the opening fights, this isn't anything Hammond couldn't have done FROM EARTH. He's just putting himself in danger. Or perhaps his overconfidence isn't unwarranted.
He next puts GL on ice, but Hal breaks out. Hammond realizes he should have been attacking the Lantern's mind, not body, and turns his ring against him.
And it would have worked too, if Hammond's head hadn't started shrinking. See, the meteor restoring his mobility is also restoring his unevolved human brain! Unwilling to become one of the plebs again, Hector warps home and exposes himself to the original rock again(?), going to his cell and immobile existence. Well, you can't keep a status quo down.
Who's Next? A genetically-modified team.
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