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Online Aliens Games
E. T. Escapes...The Robot Reformatory Game

Plays: 1810
Category: Adventure Games
A point and click game from Artkivez.com. While cruising, a Robothian patrol intercepts you. Accused of possessing a tractor beam from a missing scout ship you are taken to a detention outpost. An unpleasant memory probe awaits you unless you can ESCAPE!
Space Missiles Game

Plays: 1807
Category: Action Games
Destroy the Alien ships trying to take the Red Masses into the Sun. If the Aliens succeed it will cause an explosion so grand that it will lead to the destruction of all life on Earth.
Spaceticus Game

Plays: 1803
Category: Shooting Games
Spaceticus is a battle in space, you are the lone space gladiator that must survive wave after wave of space minions, aliens and asteroids of all shapes and sizes are trying to kill you, but don't worry you have some pretty made skills yourself. Defend yourself and show them who is the champion.
Alien Anarchy Game

Plays: 1801
Category: Action Games
The group of brave space voyagers made a crash landing on a distant planet. They’ve encountered hostile inhabitants who claimed to cut the invaders’ heads off. So, now you have to defend your crew as long as possible while repairing the ship. - 3 hero classes - 12 weapons - 7 weapon modifiers which provide unique abilities and unlock various strategies - 7 skills with 10 levels each - hundreds of enemies trying to get you dead or alive What else do you need to have fun? Oh, did we mention that the planet was the Earth and the voyagers were the aliens?
Oddball's Escape 5: Back to the Shelter Game

Plays: 1796
Category: Adventure Games
"First I had to escape the Animal Shelter. Then I was put into a dog show at the Fair. I was stuck in a dream about getting home and almost escaped a salvage yard. Now I'm trapped on a UFO and thanks to me the Earth is in danger!" How do I escape THIS?
Math Apocalypse Game

Plays: 1796
Category: Action Games
The earth has been invaded by aliens who feed from the human brain activity leaving unconscious the people. You are the last hope to resist the invasion. You will have to use your mind power to defeat them.
Flu Aliens 2 Game

Plays: 1780
Category: Action Games
Aliens are sending down a virus from outer space and the only lines of defense humans have are nano machines that can fight them back.
Aliens N Zombies Game

Plays: 1774
Category: Action Games
Aliens have landed on your planet, and converted some of the zombies as their slaves.These zombies started to attack the persons and properties on your planet. You have to shoot down these zombies, and finally make the aliens leave your planet boarding their spaceship. .
Accion Game

Plays: 1774
Category: Action Games
Este "shooter" te pondrá al mando de un cañón , para parar el asentamiento de una fuerza extraterrestre .
Backyard Alien Defense Game

Plays: 1768
Category: Action Games
Simple point and shoot game. Your backyard is being invaded by creepy aliens and you need to defend it. Start with a basic gun and upgrade to better ones as you progress through the game. The game ends when you defeat the boss.
Rocket Game Game

Plays: 1763
Category: Shooting Games
Fly your space rocket and kill as many aliens ships as possible
Alarm! A Man on the Moon Game

Plays: 1753
Category: Action Games
A spaceship landed near the small moon city. Aliens are racing for loot.
Killroom Game

Plays: 1750
Category: Action Games
An alien army is invading earth. Your job as a weapons engineer is to build a killroom to protect yourself. This is a different approach of an endless tower defense game. You have 6 different weapons in your arsenal. A lot of them require electricity so make sure to upgrade the tiles you want to place the weapons on. All weapons can be upgraded.
Emily's Thrilling Adventure Game

Plays: 1741
Category: Adventure Games
Point-and-click adventure about a little girl that is fighting with aliens ;)
Super Space Roller 2 Game

Plays: 1738
Category: Adventure Games
The game is a space themed, grid based puzzle where your challenge is to paint the space paths red while avoiding aliens.
Aliens in the Box - Revenge Game

Plays: 1738
Category: Action Games
The aliens are back!!! Use your mighty powers of gravity to drop the little green dudes into the box. Be fast if you want to save the world and return them to their planet.
Rocket Game 2: Space Survivor Game

Plays: 1724
Category: Action Games
Fly your space rocket, kill as many aliens ships as possible and collect stars to unlock new upgrades!
Alien Kindergarten Game

Plays: 1716
Category: Puzzles Games
Play the (not so) typical role of the alien single mom! Place your eggs properly and breed your own progeny. Hatch your slimy oozing eggs in 20 levels, plus countless hours of fun and extraterrestrial cuteness in random mode.
Eroc Game

Plays: 1715
Category: Action Games
"While travelling aboard the SS-Spoogob, E-roc happens to fall overboard. Landing on the planet GA5-X, he must collect as many energy cells to be able to power himself back off the planet, and back onto his luxury cruise across the galaxy!" 16 levels of rolling, bouncing, jumping and simple puzzle solving. Complete each level by finding the goal, collecting the energy cells and squashing the aliens! Lose points for getting hurt on the harder levels.
Battle of The Universe Game

Plays: 1713
Category: Adventure Games
Destroy the opposing aliens that have began destroying earth! Make sure they pay for their insulting attack!

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Tips: For things like scopes or hands which are either on or can go to the edge of the screen you should go to Player|Advanced and change the Bounds parameter to around 10 or so. This will give you a point based bounding box instead of a auto bounding box.