What I mean by this is, can a species colonize almost all galaxies? Have power over every other life form?
Not necessarily the human race. It can be any intelligent life form.
Do any species have what it takes?
-
Galaxy? Possible Universe? lol, Good luck The Universe is too large to be fully in control. With a galaxy at least, there are way less planets /space to maintain control over, so whatever species attempted to assert full control would have a bit easier of a time. You would also need a large enough fleet / armed forces/ colony ships to start colonizing planets and control them.