Everybody Knows Your Name

The opening of "Birds of a Feather" from "Resident Alien" shows the alien Harry Vanderspeigle's cheery dream in which he lives in a small human town as an alien with his alien wife and baby. But his fantasy is spoiled when he receives a package delivery containing the device he's been searching for, one which when activates sends a green shockwave across the planet Earth, killing all humans.

Example of:
Kill All Humans