The extraphysical aliens theory, also referred as extraphysical alien theory, is an extraphysicalist theory that supports that majority of the extraterrestrial intelligent life forms have evolved to the extraphysical level and it's almost or literally impossible to detect them by the conventional physical detectors and radars, where they can appear or dissapear whatever they want but humans can barely detect them, supporting that almost all or literally all extraterrestrial intelligent civilizations have evolved to the extraphysical level as consequence to keep their existence and still interact with the physical level when necessary or when they want. Extraphysical alien theory uses of concepts of extraphysicalism and of extraphysical mechanics as well to explain its theory well.