pretty much this:
The concept for my next adventure involves the players going to a world where aparently there is no supers, though is a bit more technologically advanced.
The players go there to rescue a friend (my "former" character, I am trading places with the GM), there they find him, happy, too happy and odd, he insists to make a "tour" in the dimesion to show how (his words) "Incredible great the place is" specially, he would show the players alternate versions of themselves, powerless but mostly happy.
Them, the alternates start to develop powers of they own, and [strike]hilarity[/strike] Chaos starts, at first it looks like only the alternate versions of the characters have they own powers, but others start to develop powers too.
At this point they should meet a group of "spies" (probably saving them at last moment from a group of copies), they belong to the Dark Agency, they are actually formed by mimics too, but only of people who can copy memories/skills/feats. They would investigate what the hell is happening.
The truth, is that, while everyone in that world is a mimic of some sort, there aren't any other powers, so only those who have the hability to mimic traits beyong powers look like "special", in reality, the entire world has the power of mimic... they just din't have anyone to mimic. I still not quite sure how they would find out about it. The source of the mimic from both my former character and the mimics of this world is a Magical Mirror, but in this world the mirror was shattered (because someone tried to use it against God), the "dust" that was formed was able to infect all people in the world, however a degree of inteligence started to form in the "dust" when my character went to that universe, and it start to hunger for power and "wholeness", and managed to manipulate my character subconscious to be "happy" (something of Control Emotion, with Hope).
The adventure is pretty much "open", with the characters free to decide how much they would help this world, and/or just leave it to go home before they spread they powers like a virus and doom a world with no experience with actual super-beings to become infested with them.
so.... any thoughs or criticism?