Board Thread:General Discussion/@comment-24751482-20141221181320/@comment-26010249-20141221211629

It depends. There are also dimensions where none of Ben 10 characters exist like Generator Rex dimension.

There are a lot of dimensions and even infinite probability.

Alternate dimensions can be a parallel dimension or not. Parallel dimensions are thos that has the same exact Day, Time, and Year. They could differ in Various ways like those who lives there. Like Generator Rex and Ben 10 being parallel but none of the characters exist in the other. There could also be dimensions where you will exist and some where you don't like for example, In 15 dimensions you visited there are only 7 where Ben Tennyson exist and 3 where Ben is dead and 5 where he didn't exist/never born.

Some dimensions branches from the main timeline like the Ben Tennysons that Eon gathered at Ultimate Alien. They are all from Dimensions that branched off from UA since they all have an Ultimatrix, Eon controlled them from inside it.

Some Dimensions started on its own without being influenced by the main timeline. An example could be Dimension 23 as the dimension travelling Mr. Smoothy could not travel through time yet arrived there where there is only a Younger Ben. If a person exists in an alternate dimension but is not parallel, meaning it has a different, day, time, and year, then it must have started on its own.

Other dimensions are devoid off life like the Galbladder Dimension where Upchucks store the things they eat, it expels organic things. Some like the Null Void is also devoid off life until it is discovered and used as an integalactic prison.