"Green Arrow: Taking down that green-skinned bastard got me thinking about the people of my Earth. My universe's Brainiac had never come calling. I had to warn them. By the time I got home, it was too late. My Earth was *this* close to being gone for good. But that's when the strangest cavalry you've ever seen rode in. It was a full-on, multiverse Justice League! They'd been hopping between universes, battling Brainiac in every one. I couldn't refuse when they asked me to join. I've seen what Brainiac can do. Nobody, in any universe, should have to face that threat again."