"Let's start with the idea of an infinite universe, or at least an infinite multiverse, okay?"
"That means that every moment, someone somewhere is finding a magic lamp. They wish for infinite wishes and become godlike rulers of the entire shebang."
"But we don't notice?"
"How long can you play a game with cheats active?"
"Well, it gets boring after... oh."
"Exactly. They always wish to go back to the way things were, and so we never notice these infinite trans-dimensional god-being invasions."
"Now we just find one of these assholes, beat him up, and we're all set."