Hardison and Eliot in “Unfinished Business”

You know, Fermi's paradox says that it's improbable for other life forms to exist.

Eliot

Yeah? Well, Drake's equation shows that orbiting around the hundred billion stars in our galaxy there's up to ten thousand planets with technological civilization. [Smiles at Hardison who gives him a surprised look] You never know when you might have to fight an alien.