Kingdom Hearts is an anomaly. This game shouldn't work. This game involving Disney and Final Fantasy characters shouldn't work. How can it work? They're two vastly different worlds. And yet, in 2002, the worlds of Disney and Square Enix merged beautifully in Kingdom Hearts for the PS2. The game, encapsulating the best moments of every memorable Disney animated movie and weaving them together in a Final Fantasy inspired narrative, became a critical and commercial hit. 15 years later, everyone is waiting for the eagerly anticipated new game, Kingdom Hearts III, to arrive on PS4 and Xbox One.

There's no doubt that Kingdom Hearts series has cemented itself in gaming history, however, not everything is as it seems with the Disney RPG. With a storyline that vague, dark, and let's face it, confusing as Kingdom Hearts, there's bound to be a few skeletons in the franchise's closet. In the past, we've done article highlighting little known facts about the Kingdom Hearts games, as well as the anticipated threequel. For this list, we're detailing disturbing facts about the series that may have gone under your radar.

If you're a Kingdom Hearts fan, you're gonna want to read this. Here are 15 disturbing things about Kingdom Hearts that they don't want you to know. Did you discover something new? Or, is there an even more disturbing Kingdom Hearts fact that wasn't included on the list. Let us know in the comment section.

15 Master Xehanort’s Lost Two Voice Actors In The Same Year

It’s rare for a series like Kingdom Hearts to lose two voice actors for one character, but it happened for the Japanese and North American version of Master Xehanort. Xehanort, the evil mastermind behind the events that set up Kingdom Hearts, was played in America by famed Star Trek actor Leonard Nimoy. In Japan, Xehanort was played by Chikao Ohtsuka, who also provided the voice of Gol D. Roger in One Piece. Unfortunately, both actors suffered health issues that ended in tragedy. Nimoy died in 2015 from chronic obstructive pulmonary disease, while Oshtsuka died from ischemic heart failure in the same year.

14 The Case Of The Two Kairis

Who knew Kairi had a long-lost twin? In a cutscene for Birth By Sleep, the original version for the PS Vita, the developers at Square Enix accidentally left in a mode of young Kairi hiding behind Aqua, while another mode of young Kairi is clearly seen to the side. In the PS4 version of the game, available in Kingdom Hearts 1.5 + 2.5 Remix, Square Enix removed the unbelievable mistake. So, not only was there another Kairi, but now she’s gone forever. Dark. While we know that this was a mistake, the world of Kingdom Hearts is strange and convoluted enough that it wouldn't be surprising if Kairi did have a secret twin.

13 The Cursed Song

Every Kingdom Hearts fan knows the song, "Destati," which plays during the tutorial stage of the game, Dive to the Heart, where you’re surrounded by stained glass murals of Disney Princesses. What fans might not know, however, is that ominous song has brought nothing but bad luck to the development crew. According to an interview in Kingdom Hearts Ultimania, game composer Yoko Shimomura said that whenever the staff loaded up the song, something bad would happen, such as their entire building’s electricity going out.

12 A Darker End For A Mulan Villain

When it comes to the Kingdom Hearts manga, there are scenes far darker in the book than the actual games. For example, Mulan villain Shan-Yu suffers a far worse than losing to Sora and co. Lying defeated, Shan-Yu begs Xigbar for more power. Xigbar responds with a blast to the head. Yup, Xigbar kills Shan-Yu by shooting him point blank in the head with his Arrowguns. Easily beats the fireworks death Shan-Yu suffered in Mulan, doesn't it? Mangas tend to take more of a darker route than other kinds of media, and the Kingdom Hearts ones aren't any different.

11 Xemnas Hasn't Run Out Of Final Forms Yet

Xemnas takes on many forms during the final battle in Kingdom Hearts 2, however, he originally had two more monstrous forms, before they were removed for reasons unknown. Both forms are described as "super-gigantic Nobodies" made of the Dark City from The World That Never Was. One form, dubbed King, had a humanoid appearance and wore a crown with the Nobody sigils. The other form, named Kentauros, had a humanoid upper body fused with a quadrupedal lower body.

10 A Tragic End To A Misunderstood Character

Everybody has the death of Axel memorized from Kingdom Hearts 2. How can you not? It was a surprisingly touching scene from one of the game’s most evil characters. While Axel’s self-sacrifice is mostly the same in the Japanese and North American version, there is one key difference between them. After Axel gives it everything he’s got against the Nobodies, he’s seen lying down with flames consuming his body, before fading away forever. In the American version, those flames are gone.

9 Sora The Furry?!

Believe it or not, Sora almost wielded a chainsaw in the original Kingdom Hearts game. Also, he was half-human, half-lion. Tetsuya Nomura, director and concept artist for the game, sketched the initial furry design of Sora. Disney, as you would imagine, were not pleased with the child star of their game wield a chainsaw. Members of Square Enix were also not please with Sora’s lion-like appearance, as they believed it was too similar to Zidane Tribal from Final Fantasy IX. Taking the criticism to heart, Nomura redesign Sora as a human and wield the now famous Keyblade instead.

8 Port Royale Is A Lot More Cutthroat Than You Think

The Pirates of the Caribbean level of Kingdom Hearts 2, Port Royale, sticks out for many reasons. One, unlike the past cartoony worlds, the inhabitants of this world were realistic. And two, being based on a PG-13 movie, Port Royale was noticeably darker in content, with references to blood, booze, and death. Which is why, it may come to no surprise that the North American release of Kingdom Hearts 2 had to tone done the violence in Port Royale. The undead pirates no longer catch fire, nor do they shoot you with muskets; opting instead for crossbows. When threatening to take his life, Will Turner doesn’t aim a gun to his head. Lastly, when Barbossa stabs Jack Sparrow with his sword, the weapon is no longer visible when Jack staggers back to the moonlight.

7 Post-Heartless Scar Never Lost His Crazy

Normally, when someone becomes a Heartless, they lose their physical appearance, as well as their state of mind. Scar, on the other hand, was still the same old Scar after he died and succumbed to the hatred and jealousy in his black heart. Scar, or Scar’s Ghost, to be exact, thrived as Heartless. Using his new form to mock Simba from the grave. It makes you ponder how evil someone has to be to not be affected by losing their heart.

6 Going Up In Flames

What’s the use of fire powers if you don’t get to use ‘em? In Kingdom Hearts Re: Chain of Memories, Axel certainly put his fiery powers to good use by burning the traitorous Vexen to a cinder. This all happened while the helpless Sora watched in horror. Not only is this a terrible way to go, but you have to think about what repercussions this is going to have on poor Sora, who likely suffered from some kind of PTSD after witnessing such a terrible act.

5 Olette Has Her Negan Moment

Olette seemed like such a cute and innocent girl in Kingdom Hearts 2, however, deep inside is a monster that’s ready to break out of her cage. Well, at least when it comes to the manga. As you’ll see, in the manga adaptation of the game, Olette was fully prepared to beat the crap out of Axel with a baseball bat covered in nail, in order to save Kairi. A baseball bat covered in nails! Don’t ever get on her bad side.

4 Sora's Birthday Suit

You’ll never look at Sora the same way again. When it came pre-render movies, the staff at Square Enix decided to animate the pre-render cloth separately, meaning there’s an image somewhere of a nude Sora without his Mickey Mouse-inspired apparel. Takeshi Nozue, movie director for the first Kingdom Hearts game, called it a "precious image.” That's a really weird way to phrase that, but... you do you, Nozue.

3 Kurt Zisa Is Actually Real

Well, the name Kurt Zisa is real, at least. Two months before the American release of Kingdom Hearts, Square Enix held a content where the lucky winner would have an optional boss named after themselves. The winner was Kurt Zisa of Medford, New York. Kurt Zisa became the name for the optional boss found in Agrabah; a six-armed Emblem Heartless with a cobra head similar to the one on Jafar's Snake Staff.

2 Experimenting On People

Players who were up-to-date on their journal reading learned how sinister Xemnas, the man who studied under Ansem and would later steal his identity, truly is. Following the first chapter of the Ansem’s Report, the author, unbeknownst to the reader, changed from Ansem to Xenmas. Just by looking at the dark passages about human experimentations that came after, the change in voice should have been clear in hindsight. “The experiments caused the test subject's heart to collapse, including those of the most stalwart. How fragile our hearts are!” Whoa.

1 Destiny Island Never Looked So Grim...

Before fighting Ansem in the climactic final battle of Kingdom Hearts, you were originally meant to fight your old friend, Riku once more at Destiny Island. Your home sweet home, however, wouldn’t have been the same. It would have been consumed by darkness, turning Destiny Island into Crumbling Island. The boss battle, as intensely cool as it sounded, was sadly cut. It is still available to play through hacking (the assets to the battle are still found in the game's code), indicating the decision to cut the boss fight was last minute.