Indiana Jones Swinging into action comes Indiana Jones in his trademark fedora, whip at his side. No Nazis are going to pull something over on the holiday tree when Indy's there to stop them (and practice questionable archaeology techniques). Available from Hallmark for $14.95.

1966 Batmobile Have you ever noticed how people like to look back at the history of their favorite things? Well, this ornament harkens back to the '60s Batman television show starring Adam West, when punching a bad guy resulted in an onscreen sound effect and Robin wore no tights. (Plus your friends can drive it around while singing "Na na na na na na na Batman!" when no one's looking.) Available from Hallmark link for $17.95.

Space Shuttle Ornament Sadly, the space shuttle was retired this year after 30 years of service. Honor its service and many scientific achievements with this ornament from NASA, available for $19.99.

Christmas Robots Nothing says Christmas like robots. Especially tiny red robots. All they want to do is love you and share the Christmas spirit with you and possibly assimilate you. (Note: Keep out of the reach of pets and children, as they are easier to assimilate.) Sets are available through Etsy and start at $12.

Wicked Witch of the West She'll get you, her pretty, and your little dog too. Well, she would, if she were bigger. Instead, your friends will use her lovely Christmas-y shade to give their tree that necessary bit of evil. She's available at Hallmark for $17.95, and if you want to give a matching set, they're also selling Glinda this year.

Plush Microbe Ornaments The plush microbes are the cutest infectious diseases you've ever seen. Now they come bedecked for the holidays and ready to infect on your friend's tree. Available from ThinkGeek for $24.99.

Mirror, Mirror What says Christmas better than the mirror universe and its overlords, the Terran Empire? Now your friends can have their very own scene from the iconic Star Trek Original Series episode. Mirror! Spock doesn't believe in asking nicely for answers. This ornament includes the dialogue from the scene as well. It's available from Hallmark for $29.95.

Tetris Ornaments If you're anything like us, the merest mention of Tetris gets the theme song (http://www.youtube.com/watch?v=NmCCQxVBfyM) stuck in your head forever. But even if you're not a child of the '80s, these ornaments make a fun addition to any Christmas tree. Just don't be surprised if they never seem to stay in the same place. They're available through Etsy for $25. (Why do the straight pieces never come when you need them?)

Slave I Once upon a time, there was a bounty hunter named Boba Fett. He flew around in an awesome spaceship known as Slave I, which is now available to put on the Christmas tree, because isn't that what everybody wants? Up to your friends whether they pretend he's delivering Han Solo to Jabba the Hutt, stalking the Millennium Falcon as space garbage, or if they're merely giving the ship a new home after its owner's demise. Available from Hallmark for $29.95. (Ornament also features dialogue and space shipnoises for added entertainment value.)

Ghostbusters Who're your friends gonna call? Why not give them a constant reminder by hanging this lovely ornament of the Ghostbusters logo on their Christmas tree? As an added bonus, it'll probably scare off any spirits that might see it as a good haunting spot. Available through Etsy for $28.

CLU's Light Cycle To celebrate Tron: Legacy, Hallmark has put out CLU's light cycle. How festive is this? It lights up and everything! Maybe next year they'll put out a blue light cycle, and then it's only a matter of time before the tree becomes a race track for the grid. Available from Hallmark for $17.95.

Thor Who doesn't need a Nordic god/superhero on their tree? Thor's had a good year, with the movie being well received and news of the upcoming Avengers movie, so why not celebrate his comic book roots by hanging the son of Odin (Mjolnir included) where he can best be of service? Available at Hallmark for $14.95.

Personalized Gryffindor Crest After many long years, Harry Potter fans have nothing to look forward to. The books are all out, the movies are all finished. Why not soothe their empty souls by customizing a Gryffindor Crest ornament for them (or yourself)? Available from Warner Bros. for $18.95.

TARDIS Ornament Ever notice how the actual feeling of Christmas never lasts long enough? It's forced out by the stress of getting ready and dealing with wayward family members, and then BAM! It's gone, eaten by the new year. Perhaps having your very own TARDIS will help the cheer last longer. Available from Etsy for $14.

Star Trek Ornaments This set of four hand-painted Star Trek figures is pretty darn cute. They’re also good for a compromise if whoever shares Christmas tree duties thinks sci-fi ornaments are too scary for the kids and/or not in the proper holiday spirit. Who could say no to these little guys? Available at Etsy for $48.