1. Their planet is in desperate need of fake boobs.
2. They want to replace their warp drive with Charlie Sheen.
3. They’re mad about how they’ve been portrayed in movies and TV shows.
4. Having evolved on a planet with a ruined environment, they can only survive in heavily polluted, smog-filled air.
5. They are Republicans from outer space.
6. They want to show effects companies what a real invasion looks like.
7. They love sushi, but after The Mysterians, Monster Zero, Dogora, etc., invading Japan is “so last century”.
8. They would invade New York, but they’re afraid of being attacked by King Kong, the Beast from 20,000 Fathoms, the Giant Claw, Jason, the “Lame Godzilla”, the Cloverfield monster, etc. But worst of all, who can afford those bridge tolls?