User blog comment:Robotcop/ how ben 10.00 Omnitrix got change ever new ben 10 serie/@comment-8505655-20130614233235

The first Ben 10,000 existed in an alternate universe, or so it was said at one point, anyway.

The other two differ because the future is always shifting, or at least that's the explanation we're given. I personally subscribe to the theory that time cannot be changed, so I prefer to thinks that these supposedly different Bens are either from distinct universes or are in fact one single Ben, possibly because of some escapades of Ben's future that will make sense by the time they happen. Unfortunately, this way of thinking is dashed in canon because time actually has been changed....