Prologue
Dimensions are real. Each one is parallel to all the others. The same people make different choices and come across different people to create completely different outcomes. Sometimes these outcomes are similar to the next, but sometimes they are totally different. For instance, in one dimension, the one you are in now, you will be reading this and think, "There is no way what this author says is true." In a different dimension you could be sitting in the same spot you are now, except in that dimension you may have decided to die your hair a different color. In the same way, in yet another dimension, you could be a mass murderer. I've seen it happen.
With this in mind, you need to know that everything you read is true. All the fan fictions, and books you got for Barnes and Noble are real (Except Ender's Game, a seer wrote that one. It hasn't happened yet, but it will.). In the same way, so are all the TV shows you see are real. In your dimension, they are just that, a TV show, however, in another, they are someone's life.
Sometimes, there are people called dimension jumpers. They have the means and opportunity to "jump" between the dimensions. This is a lot safer than time travel, (believe me I've noticed) because there are no major repercussions that can happen because of a small mistake. On the contrary, there is only one thing that is forbidden in dimension jumping and that is finding you. Even this is overlooked quite a bit considering the worst that could happen is you could kill the other dimension version of yourself with a touch.
The Creed is full of dimension jumpers. Their leader, The Ghost, gave them the means to do this when they joined the group. As time went on their understanding of dimensions grew deeper. Most of the members were from different dimensions themselves.
Now that you know all this, understanding this account of Kim Crawford and The Creed, will be much easier.