Some online gamblers will only play on the slots which have certain themes and the great things for these players is that there are many different types of themes available. Some of the most popular online slots themes include the Lucky Irish themed slots, as well as the branded Marvel Superhero themed slots, Ancient Egyptian themed slots, Sports themed slots, Science Fiction themed slots, Action themed slots, Fruit & Vegetable themed slots, Crime themed slots, Horror themed slots, Fantasy/Fairytale themed slots and also Movie/TV Show themed slots.

There are numerous other great slot themes out there and for each theme there is, you can find hundreds, if not more, great slots to choose from. Many of today's online slots are even recognised as having more than one theme.

Some of the other popular online slot themes include the Love/Romance themed slots, Money/Gold/Precious Stones themed slots, Luxury themed slots, Crime/Mafia/Cops & Robbers themed slots, Car/Automobile themed slots, Food themed slots, Nightlife/Alcohol/Cocktail themed slots, American themed slots, Wild West themed slots, War/Military themed slots and one of the other most popular of all online slots themes is the Ocean/Underwater/Fishing theme.

You can also now find a great deal of online slot machines which are based on famous real life figures, such as Marilyn Monroe, Bruce Lee, The Hoff (about David Hasselhoff) and John Wayne, and there are loads of Elvis Presley themed slots. There’s also one called Top Trumps Celebs (which is about numerous celebs), You can even find slots based on famous rock bands such as Kiss – Shout it Out Loud, Megadeth and Madness and it probably won’t be long before we see a Beatles themed online slot or a Madonna themed slot – unless the licensing agreements are too difficult to obtain.

Let’s take a look at some of the most famous online slots which fall into one or more of these popular themes, or genres: Spiderman: Attack of the Green Goblin, Little Britain, Gladiator Jackpot, Cowboys & Aliens, Iron Man (1, 2, and 3), Playboy, Battlestar Galactica, The Dark Knight Rises, Baywatch, The Six Million Dollar Man, The Sopranos and The Mummy.

Other famous slots include Rocky, Pink Panther, Tomb Raider, South Park, Creature from the Black Lagoon, Frankenstein, Star Trek, Jeopardy, The 50,000 Pyramid, the 100,00 Pyramid, Monopoly, Cluedo, Ghostbusters, Spartania, Mega Fortune, Fishing with Buddies, Reel ‘em in Big Bass Bucks, Cleopatra, Robin Hood – Shifting Riches and Orc Vs Elf 3D.

Some of you may have also heard about Microgaming’s plans for three Jurassic Park themed slots and also about their plans for a Terminator 2: Judgement Day themed slot, all of which should be available in casinos at some point in the summer of 2014.