so using other galaxies to account for your own
Not galaxies, a highly advanced race would be able to create universes as well. Galaxies are within the boundaries of a universe, I am talking of interdenominational travel.
Kardashev Scale roughly says
Type 0 - Your civilization is at stone age, that means you have not even developed wheel yet.
Type 1 - Means you are able to use all the available energy of the earth, that means the energy which comes from the sun to us, we will be able to use it entirely.
Type 2 - This is more advanced, this civilization is now populated in various planets, this includes planets in solar systems involving stars other than our sun. Also we shall be able to extract 100% energy of the Sun for our needs by building a Dyson Sphere around it.
Type 3 - This is a civilization which can control the entire energy of the entire galaxy, this means in our case the Milky Way Galaxy.
Type 4 - Civilization which can harness power of Multiple Galaxies, that means every galaxy would now be in 1 dyson spheres each.
Type 5 - Civilization that can control the entire energy of the universe, that means every micron of energy in the universe.
Type 6 - A Civilization which has advanced to such a level that now it exists outside the boundaries of space and time, it can not just control its own universe but can also create/destroy universes at will, can write their own laws of physics. So basically this civilization is God for the universe it creates.
From our frame of reference, only these 0-6 levels exist, beyond that might exist for the creator of our creators. To reach 6 it will take us billions of years, so that means our creators would have advanced to probably to something even beyond 6, this is what the advanced form of Kardashev Scale says.