Mirror Universes. Alternate Realities. Jersey. Whatever you call them, from Trek to Fringe , we celebrate our favorites.

With Fringe -- a show that knows quite a lot about alternate universes -- having just begun, we're look back at some of sci-fi television's most notable and out there doppleganger worlds. The type of places seemingly populated by only the evil, facial-hair'd versions of our heroes.

Star+Trek's+Mirror+Universe

Even+Mirror+Spock's+statues+had+to+have+beards.

Spock with a goatee! Sashes! Mid-rifts!The pater familias of alternate everythings, Star Trek: The Original Series ' " Mirror, Mirror " episode introduced audiences to what happens when a transporter accident takes you and three of your shipmates into an alternate reality. A place where most of your tops stop at the waist or show off your chest. You're constantly looking over your shoulder because you never know when Checkov might prison shank you to advance his career. And yes, there is that business about a very sweaty Sulu rubbing up on anything that looks remotely doable.The oversexed and underdressed qualities of the Mirror Universe were further explored in two other Trek series: Deep Space Nine and Enterprise . Both shows expanded upon the ideas of the Empire depicted in the Mirror Universe, showing off sides of a conflict only hinted at in TOS' episode.

TNG's+Worst+of+Both+Worlds+Universe

Riker's+Beard+will+be+assimilated.

The Next Generation teased several parallel universes in the episode "Parallels". Here, Worf's trippin' balls sliding between alternate realities. He eventually encounters a fleet of Enterprise-D's - all from various universes. One of which has Crazy Beard William Riker barely hanging on in a world where The Borg have conquered the Federation."The Borg are everywhere!" Rikernate exclaimed, before trying to stop Worf and the OG Enterprise from restoring the universe. Yeah yeah, Beardy's ship was so badly damaged it couldn't weather the D's warning shot. Glossy that up all you want on the communique back to Starfleet, Mr. Woof. We all know you redrum'd Riker to get to Troi. "In space, all warriors are cold warriors" and all that...

Futurama's+Universe+1

Calling an alternate world Earth-2 is kind of denigrating, don't you think? The politically correct minds at Planet Express instead divided themselves into Universe A and Universe 1 categories. In Universe 1, everything is the same, except that colors are swapped and certain key decisions worked out differently. In Universe 1, Bender is still awesome but now gloriously golden. Fry, meanwhile, is in a loving relationship with Leela all because of a simple coin toss. Sadly, Zoidberg is still pathetic no matter what color his shell.

Family+Guy's+

The best episodes of Family Guy are usually the "Road to..." installments, where Stewie and Brian embark on one crazy adventure or another. In this episode, Stewie showed Brian the wonders of his reality-hopping remote control. The duo experienced a Japanese universe, a Flinstones universe, a Disney universe, a universe so scientifically advanced that Meg was hot, and even a live-action universe.The two were eventually marooned in a world where humans were subservient to dogs. Human Brian made the jump back to the regular universe and very nearly became a permanent character on the show before meeting a very gruesome and typically Family Guy end.

Batman:+The+Brave+and+the+Bold's+Earth-2

The+Red+Hood+as+a+hero!?

Always gleefully celebrating the Silver Age of comics, this Batman cartoon paid homage to the Earth-1/Earth-2 crossovers of yesteryear when Batman and his alternate counterpart Owlman traded places. While Batman was forced to team up with heroic versions of familiar villains to battle the Injustice Syndicate, Owlman busied himself with dressing as Batman and ruining the Caped Crusader's good name.Standing in the way of the Injustice Syndicate? The Red Hood! AKA The Joker. Yep, the Joker's a good guy here. And he's pissed about Owlman changing the status quo, so cue the Batman/Joker team up we never knew we always wanted.

G.I.+Joe's+

Dreadnaughts are cops?! The Cobra Commander Memorial?! Bugs carry diseases?!Well, two out of three things don't exist in our dimension, but all three call the "Worlds Without End" universe home. Flint, Clutch, Lady Jay and Steeler become the victim of yet another one of Destro's malfunctioning weapons. This one snaps them back to an alternate dimension where the Joes are dead and Cobra finally rules the world. Here, the Baroness is a double-agent and in love with Steeler, because her Steeler died.As the skin around Steeler's eyes becomes the color of Pepto Bismol, his crazy filter breaks down. And this episode goes dark. Really dark. Grunt and Steeler find their alternate selves literally rotting in a ditch, which was a nice piece of nightmare fodder for all us kids watching at the time.Oh, and sentient bandoliers - with snake heads! - try to kill the Joes. This dimension may not be the most effed-up thing we've seen, but it's definitely its cousin.

Buffy's+

Before getting all sing-songy about her bunny fears, Anya was a vengeance demon. Have a wish to bring seven different shades of cruel onto another? Anya grants it. Thankfully, when Cordeila came to Anya, the vapid (read: hot) mall-ite kept it seemingly painless - She wished that Buffy Summers had never come to Sunnydale.Then painless turned to painful, as that wish beget a terrible world where The Master plans to harvest humans. A world where Willow is a badass vampire, and Giles has to rely on his contacts in - gulp - Cleveland to get a bead on Buffy . Cruel and unusual, indeed.Thankfully, the Scooby Gang returned to their proper Sunnydale, but not before witnessing Buffy get her neck all broke-y by the Master.