"Yeah," Ben answered with a modest shrug. "Vilgax, a Chimera Sui Generis from the Shadow Realm, was after it. The ship carrying it jettisoned it in a pod to Earth in order to prevent Vilgax from getting ahold of it once he took over their ship. He spent the better half of that summer trying to kill me so he could get his claws on the Omnitrix, but after quite a few long, drawn out battles, I managed to shove him out an airlock and trapped him in the NullVoid."
Smiling a bit, Ben took her offer and moved to sit down on the couch, relaxing back into the cushions. "The Plumbers aren't like, actual plumbers. They aren't the kind who fix toilets and water pipes. They're a government organizations that deals with the un-natural and out-of-this-world. If it has to do with space and doesn't come from what I'm assuming is another dimension--" he gestured to her "--they know all about it. They like to keep tabs on me to make sure I don't jeopardize any of the stuff they've worked so hard at keeping from the public."