Top 10 Alien Species

The Top Ten
1 The Xenomorph (Alien) The Alien (also known as a Xenomorph XX121 or Internecivus raptus, or simply a xenomorph) is a fictional extraterrestrial species that serves as the title antagonist of the Alien film series.

They have twin jaws, can impregnate any species, armored exoskeleton, sharp tail and acid blood.

The xenomorph is badass

2 Time Lords (Doctor Who)

The Time Lords, also known as Gallifreyans, come from the planet Gallifrey. They're one of the most ancient, revered and maybe even feared races in the universe. They may have a human appearance but internally they are as alien as they can get. They have two hearts and a respitory bypass system, which allows them to hold their breath very long. They have a very advanced brain, which is nothing like a human's brain. They are not only very very smart (they created black holes! ), but they are also telepaths. Their brain is their greatest weapon. Physically they are more advanced too. They don't need nearly as much sleep as humans and are a lot harder to hurt and kill. They can regenate when they are mortally wounded. All their cells regenerate, which allows them to have a completely different body and a (slightly) different personality.
They are one of the most powerful races in the universe.

These guys can regenerate themselves 12 times in total! They're intelligent and can travel in time!

3 Kryptonians (DC Comics)
4 Klingon (Star Trek)
5 Wookies (Star Wars)

Chewbacca. One word said.

6 Saiyans (Dragon Ball)

The most homicidal aliens you'll ever meet. They thrive on war and destruction.

7 The Yauta (Predator)

These guys collect skulls as trophies and they only care about hunting. They use super cool weapons like plasma rifles, nets that slice you slowly, thermal vision, camouflage and blades.

8 The Zabrak (Star Wars)

Darth Maul belongs to this race. Enough said.

9 Dalek (Doctor Who)
10 The Silence (Doctor Who)

Just imagine if these guys were real. You wouldn't even know it! The moment you look away from them you forget them.

The Contenders
11 Skrulls (Marvel Comics)
12 The Thing (The Thing)

This guy basically combines The Blob from The Blob and Pod People from Invasion of the Body Snatchers.

13 Hutts (Star Wars)
14 Asgard (Stargate SG-1)
15 The Arachnids (Starship Troopers)

They can tunnel underground and they have an armored exoskeleton and their leader feeds on brains!

16 Sangheili (Halo)
17 Zerg (Starcraft)
18 Killer Klowns (Killer Klowns from Outer Space)

An alien race that resembles something we all fear. Ronald McDonald.

19 The Vogons (Hitchhiker's Guide to the Galaxy)

These guys are crazy as hell.

20 E.T. (E.T.) E.T. is a fictional character created by Melissa Mathison who serves as the titular character of Steven Spielberg's 1982 film E.T. the Extra-Terrestrial.
21 Gorn (Star Trek)
22 Vulcans (Star Trek)
23 Cybermen (Doctor Who)
24 Ood (Doctor Who)
25 Sontarans (Doctor Who) The Sontarans are a fictional extraterrestrial agendered race of humanoids from the British science fiction television series Doctor Who, and also seen in spin-off series The Sarah Jane Adventures.
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