How about, for the rotation, we give up Superman and put Joker's Jink in it's place. Maybe a whole new themed ride:
Area 51 Experiment
Have a themed line and pre-shown about you going to witness an experimental military opening of a new dimension of space, something goes terribly wrong, where it creates a portal allowing in an alien race. The only way out is through the emergency evacuation cars which take you throughout the building trying to find a way out.
Just a quick thought I made, it wouldn't be too far off the Air Force themeing throughout that area already there.