Given that the multiverse is infinite it stand to reason that multiple dimensions cohabitate on the same planes. Of course at times singularities happen where crossing from one dimension to the next is possible, sometimes to people who are unwilling. Faerie abductions, the bermuda triangle,ufo abductions, and disappearences on the Dungeons and dragons rollercoaster are all examples of this.
My new campaign centers around some normal joes that reside on earth, and through circumstances beyond their control they fall into a fantasyesque world (not quite dungeonpunk) where things fall through to our reality. (Black choppers, strangely garbed units of human slavers, "Daytripping" are all examples of what can happen.) Wizards and priests hold positions of relative power on both planes, but discourage affiliation with political figures and shun inhabitants of the other dimensions as they fear that the knowledge of planar shifting could weaken their hold on the people that follow them.
That is the form, and now the function....
The function of this is that I've got a small group of relatively inexperienced gamers. A complete imerssion into Greyhawk, Ravenloft, or the like would very well cause a culture shock.
The first planned adventure is pretty much a blatent ripoff of the movie "Evil dead" followed by a modifed Temple of elemental evil, and a brush with a dimension hopping carnival ( a faerie ride gone horribly arwy"
Any imput, questions etc would be muchly appreicited. I think I've gotten most basic questions fielded, but I post this to my peers to see if I've overlooked an obvious question. so be brutal, but gentle please.