10/13/2012 08:20 am ET Updated Dec 08, 2012

10 Greatest Aliens In Sci-Fi History

Some space aliens are born great; others achieve it, and some have greatness thrust upon them. But even if they're here to wreak havoc, we can't help but love them.

The following ten pop-culture visitors from another world are the ones that have most completely infiltrated our collective consciousness and conquered our imaginations.

Michael Mallory is the author of The Science Fiction Universe... and Beyond: Syfy Channel Book of Sci-Fi (Universe, $40)

10 Greatest Aliens In Sci-Fi History