10 Best Alien Slot Machines to Play Online

The top alien slot machines send you into outer space for a close encounter to remember. Release intergalactic free spins, enjoy the best sci-fi graphics and music, and relax with the best gameplay. 

We have rounded up 10 of the best alien slot games for free or real cash. We’ve also highlighted the pick of the online casinos where you play and claim a lazer-guided welcome bonus.  

#1 – Alien Spinvasion

Prepare for the Alien Spinvasion in Rival Gaming’s action-packed 5-reel slot. It easily tops our list of alien slot games for its random free spins and Drop Feature. You can also play it at the best online casinos such as DuckyLuck. 

You win 11 free spins when the army general appears randomly to save the day. The free spins bonus features a Drop feature that turns Alien Spinvasion into a cascading reels slot. Plus, Alien Spinvasion features sticky wilds that remain in place and trigger a re-spin. 

Alien Spinvasion harks back to classic ‘50s science fiction movies like War of the Worlds. The dramatic music adds to the atmosphere for a superb all-round alien slot experience. Give it a play at DuckyLuck now. 

#2 – Area 51

Area 51 is a top alien casino slot game from Concept Gaming with 5 reels and 3125 ways to win on each spin. The slot celebrates the notorious Area 51 complex in Nevada, where aliens are alleged to have been taken in the 1940s. 

A host of good guys and ray guns populate the reels in Area 51, with a top payout of 500x awarded. You can also trigger up to 50 free spins by landing 3–5 scatters during any regulation spin. 

Not only can you win 50 free games, but additional bonus symbols are added during play. With an extra alien shooter game added, it’s no surprise to see Area 51 on our list of top alien slots. Play the slot for free now at Xbet. 

#3 – Alien Wins

Trigger morphing wilds and cosmic spins in Alien Wins from RTG. It’s a fun and frantic alien slot machine game that’s widely available across our recommended casinos. 

Alien Wins is a simple, cheerful online slot with 10 fixed paylines and a host of cute alien critters. Wilds appear on the central 3 reels, and multiple wild symbols will expand to cover a whole reel. You are then awarded a free re-spin to attempt an extra win. 

You may also trigger Bursting Wilds at random after any spin or re-spin. 1–3 wild symbols are randomly added to the center 3 reels.

Alien Wins is all about the wild modifiers and multipliers. It’s similar to NetEnt’s Starburst slot in that expanding wilds and re-spins determine how close you can get to the jackpot. 

#4 – It Came from Venus

We couldn’t feature a list of alien slot machines without mentioning BetSoft’s It Came From Venus. It’s a 5-reel 3D slot with some of the best online graphics you will find. But what else did you expect from BetSoft, producer of some of the best online slots in town?

You must help Skeeter the Farmer fend off the invaders from Venus while attempting to hit the jackpot. You win the 1500x top payout by landing 5x alien Venus fly traps. 

The alien (who looks like he’s stepped straight out of Little Shop of Horrors) gets quite attached to Skeeter during the game. You can ‘Save the Plant’ when the army comes hunting during the special slot bonus. Choose the right boxes and free the plant to bring it back to the farm. 

#5 – Cute Aliens

Cute Aliens is a genteel 5-reel slot from WinGo that packs a punch with a 15,000x top jackpot. You can bag free spins and earn random multipliers worth up to 100x too.

Cute Aliens works with a Scatter Pays mechanic to determine payouts. You win a prize by matching 8–12 symbols anywhere on-screen. Therefore, there’s no need to form a connecting cluster to win a slot payout. 

You can win up to 30 free spins by landing 3+ scatters anywhere. You retrigger an additional 5 free games with extra scatters. Plus, you may hit random multipliers that can enhance your prizes by up to 100x. 

Cute Aliens offers slick graphics, some great ambient music, and multipliers galore. No wonder it’s an alien slot machine game that fully deserves a spot on our list. 

#6 – Outta This World

Outta This World is one of the top alien slot games if you’re looking for a high RTP% and generous features. You may even trigger the random progressive jackpot while you play. 

RTG’s alien-themed slot features a cool Outta This World feature when you land two black hole symbols. Start by selecting from the 10 planets to unearth free spins and multipliers. 

You continue choosing until you reveal two aliens, and your free spins begin. Plus, your free spins wins are doubled throughout the bonus game. 

The random progressive jackpot hits at the end of any paid spin. The jackpot was in the low four figures when we road-tested this alien slot machine game. However, the prize grows depending on the number of linked online casinos. 

#7 – Alien Fruits 2

Alien Fruits 2 sees the return of the cute outer space critters in Bgaming’s welcome slot sequel. The RTP is up to 97.17%, and the volatility remains high as you try to secure accumulating multipliers. 

Alien Fruits 2 was released in 2024 and provides a welcome upgrade on the earlier Bgaming favorite. The reel view changes from first-person to third-person during the bonus game for a more immersive experience. 

Plus, you can stack up sticky multipliers during the 15-free spin bonus game. Look out too for the Chance x2 bonus to enhance your odds of activating free spins. 

The 5000x max. multiplier and 97.17% mean Alien Fruits 2 richly deserves a place on our recommended list. Try it for free at BetUS and see if you can navigate the high volatility. 

#8 – Alien Digger

Earn sticky winnings on your free spins in Alien Digger, Onlyplay’s out-of-this-world sci-fi slot. Enjoy the gentle electronic music while spinning the 5 reels and bagging alien miner wilds or scatters. 

You win up to 500x by hitting 2–5 alien pickaxe scatters. In addition, you trigger 10 free spins by landing 3+ scatters anywhere. 

During free spins, a winning combination sticks in place and remains there until the end of the feature. That can reap rewards if you manage to stick a high-paying combination on the reels. 

Alien Digger is a volatile online slot, but it’s worth persevering with to trigger the free spins bonus. With retriggers and sticky combos, the bonus can pay higher dividends than other slots. Give it a spin at TrustDice today, where you can easily view previous winners and payouts. 

#9 – Galaxy Invadors

Come to Galaxy Invadors (sic) for the ‘80s video game music, stay for the free spins and sticky combos. You may even trigger the game’s top payout of 5000x when you play for real money. 

As in our previous entry on our alien slots list, Galaxy Invadors makes free spins combos sticky during the bonus. Therefore, you can hit virtually guaranteed payouts every time you use a free spin. Plus, you can win another 10 free spins by hitting 3+ scatters.

It’s the funky ‘80s music that appeals in Galaxy Invadors, however. The developers seem to have mined some early ‘80s video game music from innovators like Rob Hubbard. Whether you’re a retro games fan or you just love solid alien slot machines, give Galaxy Invadors a play. 

#10 – Voyager 3 Anomaly

We end alien online slots list with another 2024 release: Voyager 3 Anomaly from Urgent Games. It’s a 100-line slot with an epic sci-fi adventure theme and mysterious symbols throughout. 

In Voyager 3 Anomaly, you follow a crew of outer space explorers making contact with a race of aliens. The reels can expand on each spin as the crew makes more discoveries. 

In addition, wilds can appear and replace regular symbols on the reels. The wild can expand to fill an entire reel. 

Wilds also remain in place if they appear during the free spins bonus feature. That’s good to know, as we found that expanding wilds made multiple appearances to activate ‘Mega’ wins. 

You’ll love Voyager 3 Anomaly if you love other Urgent Games slots like Deep Space Conquest. Give it a play for free at Las Atlantis Casino and claim your welcome bonus. 

Playing the Top Alien Slot Games Online

Ready to take off into outer space with the best alien slot machines? Alien Spinvasion is our game of choice for its overall gameplay, RTP, and bonus features. Plus, the hit rate on free spins means you’ll be dying to have another spin. 

Alien Spinvasion is also available at one of our best-rated online casinos, DuckyLuck. The casino offers 100s of themed slots for demo-play or real money. You can also claim a 500–600% welcome bonus when you open your new account.