Star Wars and MLP FiM
ACAH and MLP FiM
A fanfic of the first one exists and a parody trailer of the second one exists (look up Ace Combat: Assault Equestria on Youtube).
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On that note, Darwin's Soldiers and MLP:FiM - a three part story:
Arc 1:
An experiment with the Einstein-Rosen bridge brings the Mane Six into Pelvanida. Just before they can return them, terrorists besiege the base. Can our heroes rely on the Mane Six to help repel the terrorists?
Arc 2:
The Mane Six prepare to go home after the terrorist assault is thwarted but when one of their own goes missing - courtesy of a shady research project known as Dragonstorm, our heroes are left with no choice but to find them. Can they protect the Mane Six from Dragonstorm's clutches and find a way to return the Mane Six to Equestria?
Arc 3:
The Einstein-Rosen bridge sucessfully and safely returns the Mane Six to Equestria.
Months later, all is well and the Einstein-Rosen bridge is slated for decomissioning. But suddenly, something comes through the portal and that something is Discord! After he taunts them, he hurls Pelvanida into Equestria. Unfortunately, he "accidentally" forgets the fusion reactor and the connections to the utilities. Our heroes then find that Equestria had been plunged into infinite night by Nightmare Moon and her loyal followers now live in this land of darkess. They then have to find the Mane Six to help them return home and stop Discord. Can they do it?
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Yeah, they are along the lines of "so cheesy they're awesome" but it would be fun to see DS meets MLP:FiM.
Yeah, there will be a lot of gunplay, high octane action sequences and dazzling fight scenes - those are kind of a hallmark of my stories. But there will be more comedy than I usually put in my stories.