You're walking home from a friend's house when suddenly a weird light crosses your path. There's a shimmer...along with a feeling of passing through something. Suddenly you see a person walking alongside you.
That person...is you! Somehow you've crossed over...into a duplicate world. You and your alter-ego stare at one another. The other "you" reaches a conclusion. "I believe that I've guessed what must have happened," he tells you. "I was walking towards home. There was a haze, a poof...then YOU appeared. It must have been through a space warp, or a door...or a portal. You apparently walked through it and entered this world."
In shock and disbelief, you ponder your alter-ego's conclusion. "That's astonishing...but, how do I get back?" you ask desperately. "We both occupy a single Earth, a single family. There's no room for the two of us. What happens next??"
You suddenly witness the haze of light in back of you. The strange "door" you entered has remained in one spot! You both stare at it, standing on the outskirts of your small town. "There's only one thing to do," you say, as your self-double stands by.
The light swallows you...but there's something wrong. It's like going into a revolving door...but in the wrong direction. You experience a "reversed" polarity. The next thing you know...there's a POOF.
Professor Kirkland arrives at your quiet location, to see if he can help. The rumpled old wizard is a nuclear physicist at the local lab, and he's brought a measuring device he calls a Quantum Analyzer. "Extraordinary," he sighs, in wonder. "There's been a temporary break in the space-time continuum...a bridge has been opened between two parallel worlds. On this Earth, President Clinton was shot by Hillary after his affair with Monica Lewinsky...also, the Berlin Wall never fell."
He removes a rubber cord from his kit and wraps it onto your waist. "The light-portal is shrinking fast. This electro-static "belt" should protect your linear polarity. You must jump into the light...to return Home."
There's a shift through light and shadow. When you emerge out the other end...you see a prehistoric wilderness! A Brontosaurus is thundering across the tundra...stomping over the ground to where you stand!