There is not just one universe, but many of them, and each of them follows its own path. But, all with the same situations and the same choices, so they are all alike. Just a few unexpected events make an universe slightly differ from another. For example, in one universe, the sky of your planet could be red, in another it could be conquered by aliens, and other species would live on it.

Another example, in one of the universes and only one. The Vargas discovered out of luck, a technology that allows inter dimensional travel among them. The Kai's have decreed that such technology should not be used as it disrupts the natural order. However once every millennia they allow a tournament of power between the vast multiverse where all the fighters gather to test their might. The prize is one wish, anything you desire from the magical Universal Dragon Balls. Now various fighters both good and evil are taking part in this tournament, many of them unaware of what fate has in store...