This story is a sequel to From the Ashes

Equestria and the Avengers have formed close friendships. Friendships that may eventually help form the foundations of the relations between Earth and Equis.
There's only one man who stands in their way: Victor Von Doom. With his army, formed from the enemies of the Avengers and the Elements of Harmony, Doom intends to bring both worlds under his dominion. Separated across two worlds, the two teams must find a way to stop him, or risk losing everything.

(Takes place after Thor Ragnarok, and Father Knows Beast. Ignores Infinity War)

This story is a sequel to From the Ashes

Twilight Sparkle and the others are friends with Earth's Mightiest Heroes! How cool is that?! Following their victory, the heroes of two worlds keep in touch, visiting each other, working on projects together, and doing all the things that friends do. These are their stories.

(Have an idea for a chapter? Submit it in the comments, and it will be considered)

The war between the Avengers is over. Neither side has won. The team is scattered. All Tony Stark, Steve Rogers, and the others can do now is try to adjust to this new status quo.
Until now.
Pursuit of mysterious thieves leads the Avengers to a new planet, populated by...colorful talking ponies. Oddly enough, these ponies may actually know something about conflict resolution and personal problems. The Avengers had better listen, because only together can they stop a sinister force that plans to bring both Equis and Earth to their knees.

Cover art courtesy of ameliacostanza.

This story is a sequel to Equestria Ninjas: The Movie

The turtles and their ninja friends are back in Equestria, where they're going to the School of Friendship to make new friends and teach important lessons of what it truly means to be a ninja.

However when three enemies return looking for revenge it'll take all their strength, skill, and teamwork to overcome them and keep Equestria and the School safe.

Takes place during the events of season 8 and will eventually lead up to the finale. If you're not caught up in all the current events in season 8 I would suggest you do so because there will be spoilers.

This story is a sequel to Equestria Ninja Girls: Wanted Bebop and Rocksteady

When Sunset Shimmer discovers the Rainbooms and the students have lost their good memories of her, she and Fugitoid must enlist the help of some unexpected allies to recover those lost memories before they're gone forever, and Sunset will forever be remembered as a bad girl.

***Now with Beach Shorts

This story is a sequel to A Rainboom Turtle Christmas

Hoping to find some excitement, the Rainbooms visit the Turtles only to find out Bebop and Rocksteady have allied themselves with Krang and an alternate Shredder who hope to conquer their dimension.

This story is a sequel to Equestria Ninja Girls Rainboom and Crystal Ninjas

The turtles and their human friends return to Equestria to uncover the truth behind the disappearance of Star Swirl the Bearded and the Pillars of Equestria. But will discovering the truth lead them to an even bigger problem?

This fic contains no spoilers from Equestria Ninja Girls Rainboom and Crystal Ninjas

This story is a sequel to Equestria Ninja Girls: The Shredder's End

After defeating Kavaxas, the turtles felt it was some time for a little break. So they join Sunset Shimmer in Equestria to meet some old familiar faces, and gain a little cultural experience. While also dealing with new threats and dangers as well. Still nothing has ever stopped these green ninja machines before, and they won't now.

This story is a sequel to Turtles of Everfree

After the death of Master Splinter, the Rainbooms and Turtles team up to take the fight to the Super Shredder with the aim of ending him once again for all to avenge their sensei. Will their combined strength and friendship be enough to overcome the rage and evil of the most powerful mutant they've ever tussled with?

This story is a sequel to Equestria Ninja Girls in Space

After a mishap with a portal, the Turtles and their human allies find themselves joining the Rainbooms at Camp Everfree where there's mystery and magic in the air. With the Rainbooms gaining new magical abilities, they take their next step in their ninja training to learn to control their new powers and defend their friends from a danger lurking within the camp itself.

Sequel following the events of Equestria Ninja Girls in Space. Recommended to read before this.