When it went off the air: Canceled in 2002, just three months after the first episode aired.

Why it was canceled: When Fox pulled the plug, it was ranked 125th in the Nielsen ratings and averaged 4.48 million viewers. So, yeah, the ratings blew, but it remains a cult classic.

Potential for revival, on a scale of 1-10: 8, but not as a TV show. Serenity was a film spinoff of the series, and creator Joss Whedon has alluded to the idea that there may be another installment coming. Ya know, after he's done with a zillion other things.