Twilight Sparkle is practicing some of her spells with Spike, when she comes across an unfamiliar spell she has never seen. Spike urges her to test it out on him, but nothing happens. She goes to tell all of her friends about the weird spell, the title of the spell being, Auctus. The description of the spell is all gibberish and no one knows what it does, or will do. Pinkie Pie is so curious, she asks Twilight to try out the spell on her! Nothing happens yet again! The other four friends ask her to try the spell, but nothing happens to any of them at all! Twilight seems to be discouraged. She decides to try it on herself later that night. Nothing happens. Well the next morning we hear Spike roaring at the top of his lungs! He has grown ten inches! We go outside to see all of Twilight's friends have all grown around a foot in height and width! What will they do? Will they keep growing? Read on to find out...