You just got sucked into a different universe occupied by a whole lot of folks who came from different universes. Some of us've been here for quite a while, others not so long. Sometimes you'll find people who came from different times in their life or your life, and sometimes people'll pop back to their universe. There's a [website] that explains everything to people who like shiny text.
Meanwhile, the Joker just popped in and blew up the New York Times building. Batman's gone all reclusive on us, dunno what his sidekicks are up to besides yelling. Bruce's gone and got himself quite a few spares now. Got Nightwing and Robin, 'cept it's still Dickie-boy, just from another universe. And another Robin named Carrie Kelley, who's married to the big Grayson. And a Jason Todd, who I've never met, but I'm told he's not evil, and he's a girl sometimes. I don't ask. Think he's seeing Batgirl.
Oh, and the Joker issued a threat to everyone he's made eyes at since arriving. Meanwhile one of the other capes, some idiot, told people to go out and poke the Joker with a stick.