Crazy Mad steals the city, Great Justice and anyone else with a desire for daring heroics comes in and stops him. He spends the rest of his life in Azkaban (Depending on when this is set, he could well be one of the first major 'Guests of Honor' outside the Boskonians), on charges ranging from theft of public property, kidnapping, endangerment, and if he's as crazy as BAs post suggested, yeah, that's around the time super-villains can justifiably earn Terrorism charges.
Then you get the fun of trying to get the city back DOWN. Returning it helps show that the Fen aren't all like said Mad, and has a lot of Groundsiders in a position to, for a while, get a closer look at Fenspace then they would have expected. Word of mouth, uploads to twitter, facebook and such, all would make for some interesting PR. With the end result that the paranoid sorts on the ground have more excuses to hate the Fen, but the average folk might just come to accept them a bit better.
Of course, San Antonio will always have 'Wave in it, resulting in some odd happenings in future...
Then you get the fun of trying to get the city back DOWN. Returning it helps show that the Fen aren't all like said Mad, and has a lot of Groundsiders in a position to, for a while, get a closer look at Fenspace then they would have expected. Word of mouth, uploads to twitter, facebook and such, all would make for some interesting PR. With the end result that the paranoid sorts on the ground have more excuses to hate the Fen, but the average folk might just come to accept them a bit better.
Of course, San Antonio will always have 'Wave in it, resulting in some odd happenings in future...