I'll also nominate the Charonians from the Ring of Charon books.
Basically some kind of monstrous frankensteinian super-Borg. In the first book an Earthling accidentally triggers one of their sleepers coiled around slightly under the surface of the Moon, causing them to open a wormhole dropping Earth into orbit around a Dyson Sphere, where they observe several more life-bearing planets. The Dyson Sphere turns out to be one of a cluster of such, IIRC, which puts these guys at 'Juggling solar systems' levels. Meanwhile, the remaining folks in the Solar System think that Earth has been crushed into a black hole, and are panicking about that until the other Charonians show up and begin dismantling the planets for raw materials.