What is ben 10s most powerful alien?
Alien X
somepeople argue that it may be Waybig
Who IS the ALien x?
alien x is the first alien ben has that is a god he's the universe he can create whatever universe he imagines but ben has trouble using him because he's so powerful when ben's alien x he gets paralise because of all the power within alien x (paradox hinted that in the future ben will gain power and control of alien x)