Unicron begins to awaken, threatening Cybertron and everything on it. The Autobots and Starscream recognize the threat, but Galvatron refuses to see it as anything but an Autobot trick to get the Decepticons to lower their defenses. When talking Galvatron into admitting the threat fails, Starscream sacrifices himself to unite the two warring factions.

But instead of death, Starscream is gifted with continued life in a new land with its own conflicts.

Shoutouts to Alchemo Arrow and Legion222 for proofreading and editing.
Shoutout to Fan-the-little-demon on DeviantArt for the astounding cover art.

Follows MLP canon up to S3E13 as closely as possible.
Follows Unicron Trilogy (only the cartoons themselves, so no comics) canon as closely as possible, with small interjections of headcanon and other made up things to fill in the plot holes and lack of backstory in the actual cartoon.

If you're going to dislike, at least have the courtesy to explain why.

Before time began, there was the Cube. We know not where it comes from, only that it holds the power to create worlds and fill them with life. That was how our race was born. For a time, we lived in harmony, but like all great power, some wanted it for good, others for evil. And so began the war - a war that ravaged our planet until it was consumed by death, and the Cube was lost to the far reaches of space. We scattered across the galaxy, hoping to find it and rebuild our home, searching every star, every world. And just when all hope seemed lost, message of a new discovery drew us to an unknown planet called... EQUESTRIA.

But we were already too late...

In terms of MLP continuity, the story takes place before, during, and after the events in the episode, The Lost Treasure of Griffonstone.

In terms of Transformers continuity, even though it is unrelated to any of the universes, it does borrow elements from several timelines (most importantly, the Aligned continuity).

Also, both MLP and Transformers are owned by Hasbro.

The battle for Chicago ended with an unexpected twist. Ripped from Earth and thrown into an unfamiliar world, the Autobots find themselves, not only in strange surroundings, but also in strange bodies. Watch as they forge new bonds of friendship while defending the innocent from the return of an ancient evil.

All characters are anthro in this story.

This story is a sequel to Grogar’s Endgame

After two years of peace and happiness in Equestria since the defeat of Grogar, the Decepticons now direct their focus on a new target: earth. Shockwave rises from the shadows to create a new army to conquer earth and its inhabitants and to convert earth’s energy to energon to restore Cybertron. Grimlock and the other Dinobots team up with the Equestria Girls to put an end to Shockwave’s masterplan and the Decepticon reign of terror for good. The ultimate questions are: who shall stand? And who shall fall?

This story is a sequel to The Union of Evil

Grogar’s masterplan now come to fruition. With Soundwave and the Decepticons by his side, along with his powerful magic, he will be unstoppable. But to make things even worse, they manage to corrupt Princesses Celestia, Luna, Cadence, and unfortunately Twilight Sparkle as well. With that, Equestria has now become a barren wasteland. With death and destruction being everywhere, it would appear as if Grogar has won at last. But his endgame will come short. A new brand of heros crash-land on Equestria and discover where the Decepticons have been all along. Optimus Prime and the Autobots must find a way to defeat not only Soundwave and his army, but a new foe they have never seen. Will Optimus be able to overcome the mighty Grogar in ALL of his power or fall under his tyrannical hooves?

Grogar’s master plan is coming to full fruition as the time of vengeance and Armageddon is nigh upon Equestria. However, he needs to eliminate loose ends first before he can accomplish his goal. His scheming minions Tirek, Chrysalis, and Cozy Glow are trying to backstab him with a plot of their own. Fortunately for him, he has a mysterious friend who has been collaborating with him not too long ago. Is there something more to Grogar’s plan than meets the eye? Who is this ally that Grogar allied himself with? What does he intend to do with his would-be traitors? Will this ally of his grant him an army so powerful that all of Equestria will tremble before them? Join him as he unfolds his ultimate power and true colors.

After being captured, Starscream is given a final chance at being allowed in the Decepticons. That is, if he can survive a trip with a new prototype machine created by Soundwave called the Trans-Dimensional Warp cannon. Which transports him to Equestria, now all he has to do is return home. With the help of some new (and old) 'friends', what could possibly go wrong? It's only Starscream.
(Potential Spoilers. This is set before Breakdown is killed and before Starscream has the Apex Armor or loses his T-cog).

(Takes place after "Human Error" in Transformers Animated)

Soundwave's plan to destroy the techo organic and take over Detroit failed. And the price of defeat was death.

Or so it seemed. For reasons unknown Soundwave's spark found its way into a new world. A world far less technologically advanced. And that land was Equestria.

Some how, some way, fate smiles upon the Decepticon, and he is revived. But now Soundwave has no idea where he is, or what to do.

Perhaps he'll find the answer in the form of a hard rocking DJ pony named Vinyl Scratch. After all she seems to think there's more to the big bot then meets the eye.

The Allspark has been found in Equestria, making all sapient creature ageless and all ponies have become alicorns. The Allspark also made Twilight's son Nova Spark and four others into cybertronian hybrids. Now with Optimus guiding them, Nova Spark and his Maximal friends must protect Equestria from the Decepticons.

Contains implied sexual scene for character origin purposes.

This story is a sequel to The Conversion Bureau: United We Stand

For two years of their time, they traveled the Realm, fighting off Venger, Tiamat, and other assorted demons. Now three friends meet up once again, in another fantastic realm. Eric, Bobby, and Presto think their adventuring days are behind them, but there may be one more surprise in store for them!

This is a crossover with the Dungeons and Dragons animated series from the 1980's, and is a Hasbroverse story, taking about two weeks or so after the events of United We Stand, in late 2012. I own nothing.