Prologue

Somewhere in a lab:

"Are you sure this will work, professor?"

"Of course, the device is stable. It hasn't failed yet. For more funding we need a proper test."

"Ok, start it up."

"Sir, are you sure the procedure is working? The energy levels are too high."

"Acceptable parameters, William. Do not abort."

"Ok, professor..."

"Wait, something's wrong. There's interference!"

"Wait, do you see that? It looks like a portal! I see somebody through it..."

"Their device is causing malfunctions! We need to stop it!"

"I can't, professor! It's gonna blow!"

"TAKE COVER!"

Boom.