People of Earth
Having been watching your puny planet for some years now, we, the Thargzoids, have decided that we can no longer bear to witness your pathetic and incompetent attempts at self-governance, and have duly decided to take over control directly.
The consequent enslavement of the human race will be effective immediately, and is, of course, entirely for your own benefit.
Accordingly, one of our sleeper agents, who until now has been placed undercover on Earth to observe you, will emerge to assume complete control of the day-to-day running of the planet.