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.

Extraphysical Level Theory if a framework theory inside extraphysical mechanics that uses ideas and mathematics for advocates that there are actually N levels (dimensions / worlds) inside extraphysical mechanics, starting with the material level, that could be the level 0 or level 1 and going into the level n. But, there is a point on those n levels that they simply start to make no difference and simply start to become a stabilized void, this start level is called "divine level" and the void it is called "divine void", where it simply keeps expanding but the difference (variable) among the levels is zero or almost zero.

The Physical-Extraphysical Dependence Paradox, also PED paradox, PEpD paradox, PEDP and PEpDP, is a thought experiment and a hypothesis, or a couple of thought experiments and hypothesis, where it argues that there's a dependency between physics and extraphysics and where the physical body is dependent of the extraphysical body and vice-versa, where the extraphysical body cannot influence the physical body in the sense of create energy and work, often use of arguments against mind-body dualism and physicalist arguments to show that physical and extraphysical bodies are dependent of each other and the extraphysical is really dependent of the physical body and vice-versa. A counter-argument used against PEDP is that the physical and extraphysical are same things on different levels, such as on extraphysical monism, where it makes sense both be dependent of each other and even that the extraphysical is actually physical and vice-versa and everything depends how you see and interpret the relation between physics and extraphysics.

Post-Spacetime Extraphysicalism is an extraphysicalist philosophy that holds that extraphysics are about everything that's beyond spacetime and that what's beyond spacetime can influence the spacetime in a way that natural sciences cannot realize or detect that. Post-Spacetime Extraphysicalism also supports that extraphysical mechanics, psychoextraphysics and extraphysics are about the interaction between the beyond spacetime with the spacetime and that everything, or at least majority of the things related to spirituality, religion, esoterics and occultism exist beyond spacetime such as souls, spirits, consciousness, afterlife, gods, spiritual beings, spiritual worlds, multiverses, other dimensions and so on, and that there's 99,9% of chance that those actually exist beyond spacetime and that it's possible to superate spacetime by reaching a high level of being or by technology or by both.

Pragmatic Extraphysicalism, also Extraphysical Pragmatism, is an extraphysicalist philosophy that focus more on the practical actions and consequences of extraphysics than in the concepts or theories about that. Pragmatic Extraphdicalism believes that practical actions and the consequences of extraphysics are the best way to know about extraphysics and are the best source of extraphysicalist philosophy often rejecting the idea that extraphysics and extraphysicalism should be only theorized and imagined and not much focused on the practical part of extraphysics.

The Physical-Extraphysical Entanglement of Bodies, also shortened as PEpEB or PEEB, is an extraphysical mechanics hypothesis and theory that during astral projection and out-of-body experiences, the extraphysical body (also referred as extraphysical soul, spirit, consciousness or mind) leave the physical body, but it's still connected to it, and the extraphysical body gets all the information on extraphysical level and it transmits and register all the info on the physical body, where both work in harmony, using of properties like extraphysical superposition and extraphysical entanglement in order to work. The PEEB hypothesis can also be used to explain any kind of spiritual and religious experiences and even explain dreams and even imagination.

Neutral Extraphysicalism is an extraphysicalist philosophy, derived from extraphysical monism, where there’s no dichotomy between physics and extraphysics and both are the same thing, and believing the fundamental nature of reality to be neither extraphysical nor physical; in other words it is "neutral". Neutral Extraphysicalism believes that both extraphysical and physical are made by a neutral substance that is part of the whole physics, extraphysics and existence. Neutral Extraphysicalism is often considered the most common position of extraphysical monism, being classical extraphysical monism supporter that extraphysics and physics are equal and made of the same substance while neutral extraphysicalism supports that the neutral substance that composes physics and extraphysics is what makes physics and extraphysics being equal to each other.