"Oh god my head," Wally clutches the back of his head and sits up "What happened?" he says to no one in particular as he blinks several times to get rid of the spots in front of his eyes. After a while the spots disappear and Wally can see clearly. He finds himself in a black abyss that seems to have no end in any direction except for the ground under his feet. "Hello?" He calls into the blackness.
"Flash? You there?"
"Supes!"
"Oh Flash I'm so glad I found you, is anyone else here?"
"Not that I know of," with that superman cups his hands around his mouth and shouts,
"HELLO! IS ANYONE THERE?" There's a pause for a moment then,
"I am here,"
"J'onn!" Flash cries and he runs to hug the Martian
Then from behind Superman a comes a deep voice
"I'm here to, and did you have to yell so god damn loud,"
Superman jumps in surprise and zips over beside Flash and J'onn
"Hello Batman," The Martian says in his monotone
"I should really stop asking but how do you do that?" Superman sighs from behind the Martian, he get no answer as expected. Instead Batman looks into the darkness around them,
"I think were the only ones here."
"Yes I believe Batman is correct, I cannot sense anyone else."
Wally clears his throat for attention
"So um... guys, where are we, and how do we get out of here?"
darkness
It's a start