Super-heroes in Miami! Need Tips

[Green_Lantern]

I am going to DM in a super-hero tabletop game with a adventure that will be set in another dimension and I want the players to believe that is the real-world miami, I will even telling them to use google earth to guide themselves in the city.

Of course, is not actually the real miami, but essencially I want the players to believe it. At first it seems there are no supers, but they are wrong.

I mostly concerned with the potential problems of having them running around in a world where (aparently) there isn't anyone that can stop them. Plus I would rather having them to stay in the city, potentially using a bank robbery as a excuse.

The plot:

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?

Also, I was thinking in changing the plot and make "my" character to be locked in that dimension because of partial brainwashing, during the process he partially breaks free from the brainwashing-machine and seals the room he is it, because of the partial brainwashing he is unable to escape, but creates a duplicate that thinks it is the real him.

 

[figmentPez]

It looks like breaking this mirror brought more than 7 years of bad luck.

I'd start to think of rules as to how these mimic powers work, even if the players will never learn them directly.
How long does it take to copy a power?
How close a proximity does there need to be?
Does a mimic need to be around when the power is activated or just be around the person with the power?
Can a mimic gain a power from another mimic? What happens when you make a copy of a copy?
Can mimics loose powers?
How many powers can a mimic gain? At the same time?
Can all mimics copy all powers, or just compatible ones?
Are super-powers all that can be copied? Do powers need training to use?
etc.