An evil dragon warlord takes over Canterlot, and has kidnapped all four of the princesses! Out of options, the remaining mane five summon the only warriors capable of setting things right once more, even if their means to do so are extremely violent.
The barrier preventing monsters from returning to the surface was broken. Yet a fail-safe was placed to ensure that the humans would never see them again. New creatures appear in a cave in the Everfree, and nopony is prepared for their new visitors.
Sans, desperate to find some way of stopping the human's endless slaughter, forms alliances and takes drastic measures. But new variables are introduced... ones that could change everything.
Pinkie Pie meets some new friends, and they bond over silly friend things, like cooking, telling jokes, racking up debt, and calling the fire department.