Spike awakens within the Realm of Ninjago after being sucked into the Crystal Mirror after it's been behaving strangely, as a result after he and the Mane 6 investigate it, he is sucked into the Mirror upon hearing a strange voice, and the Mirror is broken which prevents him from coming back in any known way.

Spike awakens on the doorsteps of an old Monastery and is found by a man named Master Wu, who takes him in and lets him join a team of Ninja who all have cool Elemental powers, despite not having any powers.. yet, he's trained as a ninja to unlock his own potential and find his calling. And now Spike's life is being a part of a team who can be a new family with him, and hopefully he can find a way home one day..

Magic continues to leak from Equestria to the human world. Fortunately, Twilight Sparkle's inventions have been able to track the magic-infused objects, and the Rainbooms set out on yet another adventure.
The bad news is the items have been moved to Gotham City. The seven young women will have to dive head-first into the most crime-ridden city in the country, hoping their magic abilities will be enough to protect them, and hoping they can avoid a confrontation with Gotham's resident vigilante, the Batman.
Then again, trouble has a habit of finding them.

My attempt to cross Equestria Girls with my favorite cartoon of all time, Batman the Animated Series. Coverart by Little Tigress

This story is a sequel to The Omnitrix Hero

A month after defeating Shadow and his Negative Ten, Flash is still getting used to his new Ultimatrix. Other than that, things seem to be going well. At least until a hole opens in the sky.

Just when Flash thought he could take it easy, he finds himself meeting another teen with an alien watch. And as threats from old enemies make themselves known, the two must come together in order to save their worlds.

It's the battle of the millennium, with everything they love on the line.

Written with the help of SuperSonicHeroes

Art by SlidDiamond3214

TVTropes

Flash Sentry and Twilight Sparkle seem to enjoy their lives, normal as it can get with equestrian magic around. But one day, they along with a girl named Daisy Glimmer, and a couple of demons from hell, (Blitzo and Verosika), meet a strange man with a strange box and their lines have changed for better and for worse than they could ever imagine. So here's a question for all of you: Would you all like to travel through time and space in a box with a man that is not of this world for an adventure of a lifetime?

After losing her friends due to Anon-A-Miss sunset decided to move away and start a new life in peace creek where she meet three certain troublesome boys and eventually a certain grim reaper. Join sunset as she go through many supernatural adventure with her new friends.

Inspire by the Grimedventure of Ed, edd n eddy by Technomaru and the new Grim Edgenture of Ed ,edd n eddy by Reginald Cosmi

Because of a stupid idea, Spike finds himself at the center of a wager with Discord, the mischievous spirit of chaos. Transformed into a human and thrust into the chaotic world of Total Drama Island, Spike must prove his adaptability and survival skills to win the bet. As the competition unfolds, Spike faces challenges both physical and emotional, relying on his wit and determination to navigate the trials of the reality show.
As Spike's journey on Total Drama Island unfolds, his loved ones follow his progress with a mixture of concern and curiosity. Each challenge he faces serves as a reminder of his bravery and determination, inspiring those who care about him to confront their own fears and insecurities. And when the times of episodes comes in... his friends and family gather together, united in their support for the courageous dragon-turned-human who dared to embark on his own adventure.

In the end, whether Spike emerges victorious or not, his journey serves as a testament to the power of friendship, resilience, and the indomitable spirit of adventure. And as he returns to Ponyville, his friends and family greet him with open arms, knowing that no matter what challenges lie ahead, they will face them together.

Will he only create friendship around that show? Or would have something more in the new dimension he is going to be?

An accident in the lab sends our favorite boy genius to Equestria, as a pony. What will he do and how will he get back? The answer: Science! (Cover Art Updated!)
New FAQ! and TV Tropes!
Planned Phrases from Dexter:
“Pinkie Pie! Don’t push that Button!” /to Pinkie
“Please, Magic is the word simpletons and the ignorant use to describe what they cannot understand.”/ to Twilight
“No, I didn't strap a rocket to you. I strapped you to a rocket.” /to Rainbow Dash
“Friends? Who needs friends?”

Dexter is a boy super-genius with a disdain for anything girlish and no desire for friendship. After an mishap in his lab, he gets stuck in Equestria. How will he cope with the over-friendly ponies, and the girlish everything?
For any who do not know Dexter's Lab: http://en.wikipedia.org/wiki/Dexter's_Laboratory
[RIP Christine Cavanaugh: 8/16/63-12/22/2014] - Dexter's Original Voice Actress

After a long day of being in Canterlot High they needed a break. But after relaxing in a hot tub they somehow got transported to a bathroom and in there they meet the Rubbadubbers! So join them as they want to see what they would think about being in Canterlot High.

This story is a sequel to As the Apple Blooms

The past seven months have been quite the experience for Apple Bloom. Learning about and bonding with her uncle Ironhide, tap dancing with her boyfriend Tender Taps, helping her new sister Sideswipe, befriending Marble Pie and Rattrap, and in general, exploring her new home of Allspark Wells.

But that was only the beginning.

Now, as a new school year starts, Apple Bloom, Sideswipe, and the whole gang continue their lives as they make new friends as well as enemies, all while Ironhide, Chromia, and the others continue to provide wisdom and advice.

This story is a sequel to My Little Pony: Friendship is Cine-magic: Pooh's Grand Adventure: The Search for Christopher Robin

(Season 1, Episode 4)

Another adventure approaches for Twilight Sparkle and her friends. In this brand new mission, they journey to the underwater city of Bikini Bottom. On this day, the popular restaurant, the Krusty Krab, loses it's most valuable item; the Krabby Patty secret formula. Now the Main Six and Spike must team up with SpongeBob Squarepants, a cheery, yellow sea sponge, and Plankton, a grumpy and selfish rival to the restaurant to find the lost formula from the clutches of an evil pirate.