I've watched you Legionnaires for a long time. Studied you. Fought you. Even "saved" you. I've been both "villain" and "hero" to you. I may even be one of you. I have been, you know. I've tried to control your legacy -- change your history, your origins, your very lives. Anything that didn't quite "fit."
It is quite real, I assure you! They are incontrovertibly dead... Blown to ultimate nothingness... Just as Earth and most of the Milky Way are gone... forever! But that does not concern me! You five do! From every point in time, there are many possible futures... an infinite number... each with its own irrevocable past history! Countless parallel dimensions! My Omni-Computer enabled me to research these! I learned that the possibility of my ruling the universe exists only in possible futures where you five do not exist! So, if I am to make possible futures my reality, I must eliminate you! And I will! For I also learned, if I do not kill you-- I will die!