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Homo-Reptilia, the Silurians are a race of beings who lived on the earth before the humans. Their scientists foresaw a threat that could potentially destroy their race which was a meteorite heading for them, so they hid underground in suspended animation until it was safe for them to return. It turned out however, that the meteorite was in fact the moon. So when the moon came into orbit and the human race began, the Silurians have tried at least 3 times onscreen, to take the Earth back from the "apes". The Silurians also have cousins called The Sea Devils. They teamed an alliance together to take earth back in "Warriors of the Deep".