6-3AliensAayla.jpg Aayla Secura from Star Wars: This is one sexy blue Twi'lek woman you definitely don't want to mess with. 6-3AliensShras.JPG Shras from Star Trek: Such a pleasant shade of powder blue, you could almost mistake him for a Smurf. 6-3AliensEngineer.jpg The Engineer from Prometheus: If we are to believe Ridley Scott, we all came from these creepy pale guys. 6-3AliensUxulta.jpg Uxulta from Andromeda: There aren't many more powerful blue beings out there. 6-3AliensVenom.jpg Venom: OK, technically he's an alien-human hybrid of sorts, but we're not about to talk semantics with this guy. We like being alive. 6-3AliensVastra.jpg Madame Vastra from Doctor Who: There are a lot of cool aliens in the Who-niverse, but this awesome green woman is definitely among the coolest. 6-3AliensScorpius.jpg Scorpius from Farscape: We don't really know what color he is, but we're not about to ask. 6-3AliensZhaan.jpg Zhaan from Farscape: In a show full of standout characters, Zhaan made one of the biggest marks. We're not saying that's all because of the blue skin, but it didn't hurt. 6-3AliensZoidberg.jpg Dr. Zoidberg from Futurama: Poor Zoidberg. So much misfortune in his life, but at least he's got the cool red exoskeleton. 6-3AliensTybo.jpg Tybo from Lost In Space: Not just one of our favorite orange guys, but one of our favorite walking root vegetables too. 6-3AliensXenomorph.jpg Xenomorphs: Perhaps the ultimate all-black death machines in science fiction. 6-3AliensYoda.jpg Yoda from Star Wars: "Wars not make one great." True, but being green probably helps. 6-3AliensPaul.jpg Paul from Paul: He's just like any other grey visitor from another planet...except for the swearing...and the smoking...and the...well, you get the idea. 6-3AliensOrion.jpg Marta the Orion Slave Girl from Star Trek: Kirk was definitely happier to see her green face than he was to see the Gorn Captain's. 6-3AliensStrax.jpg Strax from Doctor Who: We're not really sure what color he is, but we dig it. 6-3AliensSinestro.jpg Sinestro: His favorite color is yellow, but we're still glad he's red. 6-3AliensTranceGemini.jpg Trance Gemini from Andromeda: Yeah, she changed colors, but we still like her purple incarnation. 6-3AliensThor.jpg Thor from Stargate: How many other greys can say they convinced people they're a Thunder God? 6-3AliensSurfer.jpg The Silver Surfer: The shiniest cosmic force in the galaxy. 6-3AliensNeytiri.jpg Neytiri from Avatar: Even on a planet where everyone is blue, she's striking. 6-3AliensMartianManhunter.jpg The Martian Manunter: Yeah, he can change his appearance at will, but we like him best when he's green. 6-3AliensDatak.jpg Datak Tarr from Defiance: Proof that white isn't always a symbol of purity. 6-3AliensChiana.jpg Chiana from Farscape: Don't let the grey skin fool you. This chick is anything but dull. 6-3AliensAhsoka.jpg Ahsoka Tano from Star Wars: Brave, rebellious, and orange. 6-3AliensDiva.jpg Diva Plavalaguna from The Fifth Element: Even among blue-skinned, tentacled aliens, the Diva is a pretty striking figure. 6-3AliensEarthGirlsAreEasy.jpg Mac, Zeebo and Wiploc from Earth Girls are Easy: Just a trio of brightly colored guys looking to score with some ladies from another planet. 6-3AliensGorn.jpg The Gorn Captain from Star Trek: He's not the only all-green alien Captain Kirk encountered in his travels, but he's certainly the meanest. 6-3AliensET.jpg E.T. from E.T.: The most adorable wrinkly brown thing you've ever seen. 6-3AliensGreedo.png Greedo from Star Wars: The most famous turquoise alien to ever shoot first (Because he definitely did shoot first. We can't stress that enough.).