“Whenever we open a worm hole we create a field that is powerful enough to fold space-time over onto itself.  The idea behind those bridge drives down there,” he pointed a finger at the floor in the direction of the engine room, “…is to jump from one point in space time to another…it’s like… let’s say there are two dots on a piece of paper and you need to get from one to the other.  Rather than drawing a straight line, you fold the paper and touch the two together instantly.  That’s the theory behind an E.R. bridge.  Now if we take that theory and apply to a multiverse premise of reality then you would have to add several layers of paper on top of 'our' piece, to represent 'other' realities.  Now when you went to fold the two dots together, you would first have to go through several other “universes” before you got through to our own.  My guess is that we either overshot or undershot the mark.” 