If you have not seen the movie Source Code, it is well worth watching.
Parallel universes. In spirituality do parallel universes or realities exist. Something that should be understood is the likelihood that parallel existences are happening simultaneous suggests that the spiritual phenomena called mergence could help explain realities.
Think of it this way. As one moves closer to merging consciousness (self) back into Source he or she is finishing Soul missions (desires) and elimination of physical, astral, and causal desires (karma).
In the way of moving closer to developing omnipresence the Soul has missions (like plays) or realities it is finishing (learning/evolving/finishing) which progress the healer, creator, teacher aspects of divinity.
It is these parallel existences as karma or movements towards or away from desires (attraction or repulsion) that the individual is living that establishes his or her finishing the Soul mission.
Finishing a Soul mission to realize the self (stopping of forming any other physical karma) and another Soul mission to develop consciousness that allows completion of remaining physical, astral and causal karma allows the Soul to merge back into Source.
It is at this point that the individual having passed through Soruba Samadhi annihilating the physical self turning it into a light body cause remain as a deathless light frame, or if the objective is to become formless non form, to merge as consciousness omnipresence.
The move the Source Code plays well into the reality of spiritualism, existence and metaphysics. Entering the Source Code (Soruba Samadhi) is a divine way of altering creation. In Soruba you are beyond causation and can have pure creation. It is this aspect of reality finishing karma (which occurs with Soruba Samadhi) and then the progression to finishing the second Soul mission that allows ones Soul to merge back into Source.