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In addition to mutants, Eternals and Deviants, several other intelligent races have existed secretly on Earth.

These include: The Inhumans, another genetically unstable race ( like the Deviants, but in their case its due to their use of a substance called the ' Terrigen Mists ') that was created by a Kree experiment long ago ; The Subterraneans, a race of humanoids adapted to living below the surface, created by the Deviants ( some subterraneans were transformed into ' Lava Men ' by a demon ); and Homo mermanus, a humanoid race of water-breathers that lives in Earth's oceans.

Most of these races have advanced technology but existed hidden from humanity until recent times.

More variants of humanity can be found in the Savage Land ( see places, below.

) Most of the Savage Land races have their origin from a group of primitive ape men who seems to have escaped the Celestial experiments whose influence is present in all modern Homo sapiens.

Other leftovers from the era where primitive humanoids walked the earth still exist, such as the altered Neanderthal known as Missing Link, an old enemy of the Hulk.