Sablewing the Wicked, a black-hearted dragon with an immunity to magic, invades Canterlot with his army of diamond dogs, goblins, and kobolds. As they attempt to defend their kingdom, Princess Celestia and Princess Luna are captured and imprisoned by the foul reptile, and he proceeds to take over the entire city. A rescue attempt made by Princess Cadence and Twilight Sparkle is then performed, and immediately thwarted, resulting in their capture as well.

Having used the Elements of Harmony to save the Tree of Harmony recently, and being one pony short of using them anyhow, Twilight Sparkle's friends find themselves in the worst predicament imaginable. After raiding the library in the Castle of the Two Sisters in search of an answer to their problem, they happen upon, and then proceed to use a spell that shoots out into the multiverse in search of brave, suitable heroes to combat this monster.

Answering the call, four strange characters come forth: The Green Knight, Orange Knight, Red Knight, and Blue Knight; each powerful warriors in their own separate rights, who have honed their expertise in the field of beating the ever-living crap out of anything that has the sheer balls to simply be standing in their way.

Having been bored out of their minds in their home dimension (and being threatened that they would never return should they decide not to help), the four knights jump to the challenge to RIP AND TEAR and rescue some more princesses. They set off, weapons and sandwiches in hand, to kick some monster butt, crash some castles, and take names as violently as physically possible!

...Oh, and a certain mailmare with strabismus joins along on the mad adventure.

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