Not much is known about the Sub-Earth Men. They are a subterranean culture that lives somewhere below the surface of the Earth near Camp Lehigh. At some point in the past they learned of the existence of the surface world from an explorer who found their domain and taught their king how to speak English. He passed this knowledge to his daughter and future successor Queen Medusa.
By the summer of 1942, the Sub-Earth Men's domain was rocked by earthquakes caused by a Nazi spy attack on Camp Lehigh to raid of of weapons for use in subversive activities. A number of the Sub-Earth Men were led by Queen Medusa to the surface world. Upon their arrival the tunnel collapsed seemingly trapping them on the surface.
When they attempted to approach an American hunter in peace, he panicked and shot one of the Sub-Earth Men. He then returned with the local sheriff and they attempted to wipe out the Sub-Earth Men but were stopped by the intervention of Captain America and Bucky. They convinced Queen Medusa to go with the sheriff. However, when she was simply locked up in a jail cell, Cap and Bucky freed her and returned her to her people.
By this time, her people were convinced by the Nazi operative known as the Spook to wage war against the Americans. Although the Queen refused, she was outvoted and she seceded control of her people to the Spook. The Sub-Earth Men waged a bloody attack on innocent American civilians. Once more their former queen attempted to talk them out of violence and was almost stoned to death if it were not for yet another intervention by Captain America and Bucky. Cap agreed to leave Bucky as their hostage as he went to get the military and convince them to come in peace. However he was knocked out by the Spook who enticed a battle between the two forces. Cap eventually revived, saved Bucky from death at the Spooks hands and convinced the American military to stand down and broker a peace deal with the Sub-Earth Men. In the aftermath, the Spook was revealed as reporter Hans Knutte and captured and the Sub-Earth Men brokered a peace agreement with the American government.
The ultimate fate of the Sub-Earth Men is unknown, it's entirely possible the American government worked to return them to their home domain as they have not been seen on the surface since.
Powers and Abilities
Average Strength level
Population: Population of this race is unknown.
Type of Government: Monarchy
Level of Technology: Primitive. They did not appear to be a warlike race initially until they were provided standard firearms by the Spook and convinced to go to war.
Cultural Traits: Cultural traits unknown.
Representatives: Queen Medusa
The Sub-Earth Men appear to be normal humans[Official Index To The Marvel Universe:The Avengers,Thor & Captain America#4(9/10) says they are Neanderthal-like subterraneans], unlike most other underground species that have such as the Moloids who were the creation of the Deviants. How they Sub-Earth Men came to live below the Earth is unexplained.
The Official Index To The Marvel Universe:The Avengers,Thor & Captain America#4(9/10) says their giant worm-like steeds resemble the Kraawl[Fantastic Four#127( /72)].
Links and References