Its an ordinary day at the Pie family rock farm as sisters Marble and Limestone work the farm when Marble discovers a strange colored rock in the ground. Curious, about it she picks it up to examine it, only to get shocked by the rock. Suddenly Marble, finds herself growing until she reaches one hundred feet tall. The family then calls upon Pinkie Pie and Twilight Sparkle to help Marble return to normal size. While that’s going on Marble tries to continue to live her life as normally as possible which, is hard to do when you're as big as a house.