Goom

Before Marvel Comics became Marvel Comics, Marvel Comics was Atlas Comics. They had mutliple comics where each issue a (different) giant monster attacking the Earth. One example of these monsters was Goom.
Goom is an alien from Planet X with mental powers (hence his giant head) and alien technology. He tried (and failed) to conquer the planet Earth. Goom's son, Googam, also tried to take over the world. The Collector (an alien that collects living beings) imprisoned several monsters (including Goom). Mole Man freed the monsters. However, several superheroes beat up Goom and his fellow escapee monsters. Then, Mister Fantastic imprisoned the monsters in the Negative Zone. Goom escaped (off panel) and tried (unsuccessfully) to find a human mate. He disappeared thus abandoning Googam (leading him to join the Fin Fang Four). S.H.I.E.L.D. captured Goom and had their Howling Commando Monster Force unit imprison him.
References:

• http://en.wikipedia.org/wiki/Goom