The Empire vs. Earth
Since I'm feeling like an ass today, I figured we'd do this:
The Empire circa Dark Empire, with Palpatine's "new technologies with which to wage war against the New Republic", Palpatine's small army of dark side adepts, the Eclipse warships, and finally, Palpatine himself at the height of his powers.
Versus Earth.
Assume that Earth is united into a coalition commanded by the "tactical genius" of George W. Bush (I believe Hewhoknowsnothing referred to him as such).
Discuss.