(STORY TIMELINE: RVB Season 5, MLP FIM Season 2 with a lot of changes).
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After the events of the Season 5 of Red vs Blue, both teams began to be more "kind" with eachother until something unbelievable happened: Caboose, Church, Grif, Sarge, Simmons, Sister, Tucker & an Original Character were teleported to Equestria, where all of them will have to live in harmony, but that it won't be so easy because of the Project Freelancer & Equestria's Enemies.
What will happen to them? Let's find it out.
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Postdata: I'm not the owner of My Little Pony or Red vs Blue.
2nd Postdata: It's based on the popular's fanfics I Against I, Me Against You & My Little Caboose.
3rd Postdata: It is not plagiarism. I just take a few ideas just as some of the characters (thing that almost everyone does), they're ways to act & etc.