I just finished a storyline that involved an epic battle between aliens and vampires.
The aliens were convinced the vampires were a plague on Earth and it was their duty to eliminate them and save this poor, helpless planet. But one alien was an evil overlord who secretly wanted to take over Earth in the name of Sixam.
A few vampires made truces with the aliens and actually helped them defeat rivals. (The vampires in my game are not known for banding together in times of trouble--they're very much everyone for themselves.)
Any vampires who joined the aliens' side had to have a strict diet of plasma fruit/packs only. They also had to change their dark form to an alien form.
Eventually, the dust settled, the evil alien was defeated, true treaties were made, and Sixam-Earth Peace Day is a holiday on the calendar now. It's in the summer, and it is celebrated by going outdoors, doing water activities, gardening, and just generally enjoying the Earth and its beauty.
Now I'm playing Get Famous so we'll see how that goes. :)
