There’s a clap of thunder, a flash of lightning, and instantaneously there’s hundreds of fighters in a cramped stone cave. Behind them, a dark nothingness, which they cannot pass. Ahead, a small light. One among them knows exactly where they are, he floats up, and fly to the leads. Not sure why, but knowing there’s nowhere else to go, the rest follow. As a herd, the grouping walks through the corridor, past larger than life facsimiles of the Seven Deadly Sins, towards a growling light at the end of the tunnel.
The tunnel opens to large rock, floating in the nothingness. A giant being in a white robe with a long white beard who seems to be encompassing the entire landmass smiles and booms out,
“I AM THE WIZARD SHAZAM, AND I AM HERE TO DO MY PART IN FAIRNESS TO CREATION.”
There’s a blinding white light and a shatter of thunder. As the heroes and villains sight is slowly restored, through quickly blinked eyes, they find that they’re all seated in a magnificent dome, floating softly on cloud seats and covered by pulsating yellow electricity. Just as any of them can even start to comprehend their bizarre new surroundings, and the Trinity of Earth 1 and the Circus of Crime from Earth 616 vanish from their seats and the find themselves standing on the hard tanned rock in the center of the stadium.