Best Alien Themed Slots 2021 to Play in the US

Humans have always been fascinated with UFOs, aliens, and everything extraterrestrial. 

Whether it be sightings or alleged abductions, we have seen aliens become a prevalent theme in various films and television shows. Alongside this, the demand for online alien-themed slots has been astronomical in the last few years. So if you are looking for a slot that is out of this world, then look no further than this article!  Here at CasinoRange, we have compiled a list of our favourite alien-themed slots from some of the most popular game developers.

List of Alien Themed Slots Games

BetsoftRTP: 97
EyeconRTP: 96.624
Play'n GORTP: 96.25
ELK StudiosRTP: 96.1
The Real Time Gaming PlatformRTP: 96
PlaytechRTP: 96
ELK StudiosRTP: 96
AinsworthRTP: 94.5
Play'n GORTP: 94.5
Kalamba GamesRTP: 86

What are Alien Themed Slots?

Alien themed slots can range from celebrity aliens, friendly aliens, space invaders, or even flying space cows. These games are ideal for those who want to take part in an intergalactic adventure from the comfort of their own home. Graphics in alien-themed slots are usually darker with ultraviolet hues, which adds to the out of space atmosphere. If you are looking for an escape, then these games are definitely for you!

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The Best Alien Themed Slots to Play in the US

Here’s a list of some of the most popular alien-themed slot games that you should try.


Iron Girl

Released on the 4th of October 2018, Play’n Go’s Iron Girl is one of the most popular alien slot games. The 20 payline, 5 reel slot is action-packed, focusing on female space superheroes fighting intergalactic villains. The game includes a majority of bonus features, including free spins, multipliers, and extra-wilds. Iron Girl has an average RTP of 94.5%, and if you manage to achieve any of the special features, you can be in for a chance of winning up to 1000x your stake. The game has blueish, vibrant visuals with stars twinkling around the screen. When you push the spin button, the background changes in real-time, creating the feeling that you are travelling through space. Electronic-synth music is played throughout the game, adding to the futuristic ambience. If girl power fighting bad guys in space sounds up your street, then this alien-themed slot is for you!

Iron Girl

Invaders Megaways

Invaders Megaways by WMS is a unique and innovative game on the list and the sequel to the ever-popular Invaders of the Planet Moolah. If you haven’t guessed by now, this game incorporates space cows flying around the galaxy attached to their own UFOs. This slot is played across six reels with 1000000 paylines, giving you so many ways to win big!

You can wager between £0.25 per spin up to £10 per spin, so you can maximise any possible returns. With multiple chances of bonuses, free spins and five wild modifiers, it appears Invaders Megaways has raised the bar for game designers everywhere. This fantastic slot has stunning imagery, the cows are hilarious, and the aliens are stereotypically green and bug-eyed, we think you will love it.

Invaders Megaways 2


Developed by ELK Studios, Visitors is a slot game focusing on aliens descending on earth. However, this is not a threat to humankind, because these extraterrestrials are on the hunt for cows! The game is quirky in design with primary colours, simple cartoonish graphics and music that transports you back to the 80s. With visuals mirroring an arcade-style, Visitors is all about not taking itself too seriously.

The 5 reel, 3125 payline game has a great winning potential with the chance to win 10,000x your wager! Players must land three, four, or five identical symbols on consecutive reels, starting on reel 1, in any position, to win. Expanding symbols, sticky wilds, and large multipliers are just a few of the extra bonuses offered. If you want to experience a fun and silly game with so many chances to win give Visitors a try!


Money from Mars

The last slot on our list has been brought to us by Ainsworth, with a focus on friendly disco loving Martians experiencing life on Mars! These fun-loving aliens are depicted as classic celebrities with a soundtrack that is lively and dynamic and complements the game’s concept. Of course, the reels are set on a Martian landscape awash in warm brown, yellow, and pink hues.

The RTP of this Alien slot game stands at 94.66%, and its volatility is medium. It is played on five reels and has 50 pay lines. You must activate the money bags feature and collect 15 or more money bags symbols before the round ends to win the maximum prize of 25000x your bet. This fun, easy to play the mobile-friendly game will ensure you have an enjoyable experience with a chance to win big!

Money From Mars 4

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