Big Macintosh is a stallion of few words, but that doesn't mean he's slow or uneducated. Unknown to any outside the Apple family, he's a wiz at math and finds himself smitten with the one pony who could share his love for numbers, and who just so happens to be the personal student of Princess Celestia; Twilight Sparkle. With a "gentle" nudge from his persistent sister, Big Mac manages a date with the purple unicorn, but a relationship might turn out to be more work than either one bargained for.