well, my first one that sparked the idea was i had a subspace portal, with a large fleet of Terran-Vasudan ships blockading it. The first ship, an orion, was preparing to move in and activate the portal, when it is intercepted by an unknown shivan super-juggernaut, the first contact with the craft. The jugg rips apart the fleet, and moves on. Now I was originally going to make this into a mission, but it seemed rather pointless to throw a bunch of fighters into it, when the main idea was to introduce this super-juggernaut. Besides, when the players fighting, they miss some of the action, so voila, i made a movie out of it.