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Some slots are out of this world…no, really. Slot games are no strangers to weird and wacky themes, but some of them get verifiably interstellar. Aliens, extraterrestrials, or invaders from another planet have found their way into countless online slots. Today, we’re beaming them up and highlighting the best alien slot games you can play online.

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Space Invaders

Space Invaders

  • Provider: Inspired
  • Max prize: $250,000 
  • RTP: 95%
  • Minimum bet: $0.20
  • Maximum bet: $200
  • Volatility: High

One of the most iconic video games of all time brings its extraterrestrial visitors to the slots world in Space Invaders! From inspired Gaming, Space Invaders adapts the old arcade game for the online casino arena, complete with simple, suspenseful descending 8-bit music and pixelated alien invaders. 

Landing three coin symbols on the reels will trigger a bonus feature. There are six different rounds, including four themed free spin bonuses, UFO Climber, and Shootout. 

For fans seeking an otherworldly slot experience with a hint of nostalgia, Space Invaders is the easy choice. 

Invaders from the Planet Moolah

Invaders from the Planet Moolah

  • Provider: Light & Wonder
  • Max prize: $200,000
  • RTP: 96%
  • Minimum bet: $0.25
  • Maximum bet: $125
  • Volatility: Medium

Udderly out of this world! The Invaders From The Planet Moolah slot machine doesn’t have aliens abducting cows. Instead, the aliens are cows…or at least, cow-like. They have antennae, extra eyes, and they ride in flying saucers.Invaders From The Planet Moolah pioneered the cascading reels feature. Winning symbols are beamed up by the cows above the reels, then new symbols fall into their place. Connecting strings of wins through multiple cascades will award free plays. Four cascades in a single spin will give you 7 free spins, while 5 will get you 10 free spins. You can get up to 50 free games.Cow symbols serve as wilds, substituting for any symbol. They appear on reels 2-5 only.

Space Wars 2 Powerpoints

Space Wars 2 Powerpoints

  • Provider: NetEnt
  • Max prize: $320,000
  • RTP: 96%
  • Minimum bet: $0.20 
  • Maximum bet:  $100
  • Volatility: High

The Space Wars 2 Powerpoints thumbnail is relatively unassuming, but behind it is a vibrant and dynamic slot game for fans of all things alien and outer space. The 6×6 reel array is packed with weird, angry-looking alien creatures that are somehow also adorable. Symbols that are part of a win leave the reels, leaving space for new ones to fall in. Triggering multiple wins in a single spin can get you a free spins bonus. 

If you don’t want to wait, you can click the “buy feature” rocket, which lets you spend a certain multiple of your bet for 8, 12, or 16 free spins. 

Space Wars 2 is easy to recommend for new slots players or anyone looking for something different. Instead of traditional left-to-right wins, any three or more symbols in a vertical or horizontal row will win.

Interstellar Attack Spin-crease

Interstellar Attack Spin-crease

  • Provider: High 5 games
  • Max prize: $250,000 
  • RTP: 97.2%
  • Minimum bet: $0.20 
  • Maximum bet: $15
  • Volatility: Medium

With a medium volatility rating, an RTP of 97.2%, and 50 pay lines, Interstellar Attack is an amazing alien-themed game for any slot player, beginner, or expert. The game clearly draws inspiration from the original Space Invaders arcade title, but it puts a modern twist on it. 

The 5×5 reel array features pixel-art aliens descending on your ships, which have their own horizontal reel at the bottom. Asteroids and aliens can land above your ships and fall into the line of fire. Hitting aliens gets you wins while hitting asteroids charges special power-up meters. 

All of these mechanics are united by solid art and sound design that meld the fun of arcade alien shoot-em-ups with popular slot gameplay.

Little Green Men Nova Wilds

Little Green Men Nova Wilds

  • Provider: IGT
  • Max prize: $250,000 
  • RTP: 94.04%
  • Minimum bet: $0.20 
  • Maximum bet: $400
  • Volatility: Medium-High

Here’s a bonafide classic: three-eyed green men in disc-shaped spaceships! 

These aliens can land upon the reels in one of four colored spaceships—red, blue, yellow, and green—to trigger 1 of 4 modifiers on any spin. Modified spins can be multiplied up to 25x. 

Plus, there’s a bonus round—landing three BONUS symbols starts free games, where the reels double in height. 

The entire game feels otherworldly to the max, with a theremin-led soundtrack and plenty of sci-fi art for anyone looking to enjoy alien slots. 

Space Christmas

Space Christmas

  • Provider: 1X2 Gaming
  • Max prize: 800x bet
  • RTP: 96%
  • Minimum bet: $0.20
  • Maximum bet: $50
  • Volatility: Unknown

When Santa runs out of coal for naughty children, does he venture to the moon in search of something else to put in their stockings? We may never know, but Space Christmas comes close to giving us an answer.In this holiday game, Santa and his reindeer take to outer space, where gifts become odd polygonal shapes and candy canes look like spiral galaxies.Space Christmas has a free spins feature and a bonus feature. Land 3, 4, or 5 Christmas tree symbols for 10, 14, or 18 free spins, respectively. The bonus triggers if you land 3, 4, or 5 bonus symbols. The bonus round is a picking game.

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About the Author

Cole Rush

Cole Rush

Cole Rush is a Chicago-based writer and contributor for His work has been showcased in various gaming industry magazines and online columns. Prior to freelance writing, Cole spent seven years in communications at a gambling and lottery supplier. A Chicago native, Cole's favorite teams are, predictably, da Bears and da Bulls. When he visits the casino, you’ll most likely find him playing Mississippi Stud or spinning some slots.
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