I was watching the tv series called, through the wormhole, and they mentioned a theory about multiple universes that are separated by a very small distance, like parallel membranes. They mentioned that there is also a theory that says that black holes are in fact connections between these 2 universes and that the matter travels between them (goes into a black hole in this universe, goes out from a white hole on the other) since the gravity is so strong it manages to pull the other universe's membrane close enough for stuff to travel between them. Also I remember another episode mentioned that the big bang could in fact be these two universe membranes colliding into each other.
So this got me thinking, wouldn't many black holes attract each other and become a super gigantic point of matter that is so strong that it pulls the other universe strongly enough to touch it in which makes the universe with the black hole finally blow up and expel the matter accumulated there as if it was the big bang? This kind of effect would also account for the way the universe expands (if you visualize it as a membrane that has been pulled inwards, when released it grows uniformly in every direction similar to a drop of water creating ripples.
But then i was told black holes would not attract each other because they are drifting away from each other, the speed at which both of them separate from each other is faster than the speed of light which is said to be the speed the gravity force travels at. But wouldn't they still attract other black holes that are not as fast? (even if they are just slowly moving towards each other) and thus decelerating the speed they get away from each other. And these black holes could be affecting other black holes close to each other, and at the end everything is really affecting something else because regardless of the speed they are within something's gravitational pull which in turn will lead to an implosion generating a super massive black hole (like i described before) making another big bang?