The 5 Best Alien Slot Machines You Should Play Online

The top alien slot machines combine the best parts of sci-fi with the excitement of modern slot games. In addition to showcasing fascinating alien creatures, these slots are also loaded with great bonus features.

This slots guide will provide an in-depth look at the five best alien slot games available online today. I will discuss the key features of each slot game and tell you the best casino site for playing every game on this list for free.

Alien Spinvasion

My countdown of the best alien casino slot games starts with Alien Spinvasion from Rival. This slot game has an RTP of just 95.14%, the lowest of any machine on my list. Despite its low expected return, players can still win tons of prizes by taking advantage of this game’s exciting bonus features.

It starts with the sticky wild symbols, which automatically trigger a respin if they create a winning combination during the base game. You will continue to trigger respins as long as more sticky wilds appear. Alien Spinvasion also includes free spins that are awarded any time the Army General randomly appears in the base game.

During free spins, every symbol is turned into a drop symbol, and every win triggers the drop win feature. This cascading wins bonus is a great way to maximize your winnings during free spins.

SlotsandCasino is the best place to play Alien Spinvasion online today. You can play the free or paid version, and new members can claim up to $2,500 in bonus funds with the 500% welcome bonus.

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Ally Alien

Ally Alien from DiceLab is another great example of the best that online alien slots have to offer. The game is set in outer space and features multiple aliens and planets as its symbols. It offers similar bonus features to Alien Spinvasion, including free spins and unique wild symbols.

The wild symbols in Ally Alien can replace any other symbol in the game. They are especially useful during the collapsing wins feature. If you can land four or more collapsing wins in a row, you will activate the free spins mode and receive a prize multiplier.

There are six combinations of free spins and multipliers up for grabs in this alien slot machine. The most free spins you can win at a time is 50, and you can retrigger free spins endlessly. If you trigger the top prize with nine collapsing wins in a row, then you have a chance to win a 2500x multiplier.

You can test your luck in Ally Aliens at Red Dog Casino. It offers a free demo of the game and has a paid version as well. New members of Red Dog can choose from multiple welcome bonuses, including a 275% crypto bonus worth up to $2,750.

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Alien Fruits

Alien Fruits is a 6×5 slot game that is both a great alien slot and a great fruit slot. It was developed by BGaming and has an RTP of 96.03%. This slot has a larger grid than other games on my list and uses a cluster pays system instead of traditional pay lines.

You can also trigger the free spins round for free during the base game if four or more scatters appear on the board. Additional scatters that appear during free spins can retrigger the feature. There is also a buy feature, so you can trigger the free spins mode at any time.

In addition to the free spins mode, Alien Fruits also makes it easy to win massive prizes. It has an exciting multiplier feature that appears during the free spins. The multiplier symbols offer a random multiplier between 2x and 100x your stake amount.

There are free and paid versions of Alien Fruits available online at Bovada Casino. New members of this site are eligible for one of two casino welcome bonuses, including a 375% crypto bonus worth up to $3,750.

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Back to Venus

It Came From Venus by Betsoft was a popular alien slot game in the mid-2010s. Back to Venus, the sequel, offers the same excitement as the original, with a higher RTP. The original game had an RTP of 95.80%, and the sequel has a return of 97.07%.

An increased RTP is not the only advantage the sequel has over the original. The hit rate, for example, has also been increased from a below-average 10.08% to an above-average 45.28%.

Back to Venus has plenty of bonus features, too, including sticky wilds that stay on the reels for two additional spins. There is a free spins mode as well that you can activate with the rocket bonus symbol. Losing spins can quickly become profitable, too, if you randomly trigger a respin with the stick and respin feature.

If you want to try the Back to Venus slot game today, then you should sign up for an account at Ignition Casino. It offers a free demo and an exciting paid version of the slot. New members can get up to $1,500 in bonus casino funds with the crypto welcome bonus.

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Spartians

The fifth and final spot on my list of the top alien slot machines is Spartians by Saucify. This slot game takes place on Mars and features several little green Martians as symbols. The Martians are dressed in classic military armor, similar to that of the legendary Spartans.

There are three different types of wilds in Spartians. The first is a double-high symbol that offers a 2x multiplier for any winning combination. There are also two different wilds that offer free spins, one that is two rows high and one that is three rows high.

The triple high wild symbol only appears on the second and fourth reels during free spins. All wilds, including ones during free spins, offer a 2x multiplier. You can win up to 18 free spins at a time in Spartians.

Spartians is available online for free at Drake Casino. This casino offers a 300% welcome bonus worth up to $6,000 over their first three cash deposits.

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