Vote for the greatest science fiction theme song of all time

Welcome to the first io9 music smackdown! We're putting together the ultimate science fiction (and fantasy) playlist — all the music that everyone should have on his or her iPod.

Today, help us decide which theme tunes absolutely must be in the mix. Which would you rather have in your ultimate science fiction playlist: the theme from Firefly or BSG?

Here are the rules for this particular playlist. Only original TV theme songs are eligible (so Chuck's Cake tune and True Blood's "Bad Things" are out, but just for this round). There are no cartoons for this round as well, you'll get your TMNT cartoon theme song smack down soon enough. You can vote for 4 total. The winners will be added to io9's ultimate play list. The poll is at the bottom of the posts, and we've included every single song on the list so you can decide first-hand.

Remember: you can vote for up to four items.

The Green Hornet

Knight Rider

Battlestar Galactica (New)

Star Trek (Original)

The Twilight Zone

The Avengers

Batman

The Greatest American Hero

The X-Files

Doctor Who

Mystery Science Theater 3000

Firefly

Star Trek: The Next Generation

Wonder Woman

Millennium

Buffy The Vampire Slayer

The Adams Family

Fringe

Twin Peaks

Mission Impossible

The Prisoner

The Six Million Dollar Man

Battlestar Galactica Original

Stargate SG-1

Buck Rogers In The 25th Century

Alien Nation

Game of Thrones

Angel

Tales From The Crypt

Lost In Space

The Secret World of Alex Mack

Space 1999

UFO

Get Smart

Stargate Atlantis